diff --git a/MUNGA_L4/L4APP.H b/MUNGA_L4/L4APP.H
index 9d65613..d01c3e2 100644
--- a/MUNGA_L4/L4APP.H
+++ b/MUNGA_L4/L4APP.H
@@ -79,6 +79,9 @@ public:
 	static unsigned int GetScreenWidth() { return mScreenWidth; }
 	static unsigned int GetScreenHeight() { return mScreenHeight; }
 	static bool GetFullscreen() { return mFullscreen; }
+	// -fit: borderless window filling the monitor, with the render size
+	// chosen to match the cockpit canvas it will be presented into.
+	static bool GetFitDisplay() { return mFitDisplay; }
 	static Logical GetSeeSolids() { return seeSolids; }
 	static unsigned long GetNetworkCommonFlatAddress() { return networkCommonFlatAddress; }
 	// The front end's multiplayer path turns network mode on at launch
@@ -93,10 +96,17 @@ public:
 	static CString GetRIORecordingFileName() { return rioRecordingFileName; }
 
 protected:
+	// Pick mScreenWidth/mScreenHeight from the monitor. Runs after the
+	// whole command line is parsed, so an explicit -res always wins no
+	// matter which side of -fit it appears on.
+	static void ChooseFitResolution();
+
 	static HINSTANCE mhInstance;
 	static unsigned int mScreenWidth;
 	static unsigned int mScreenHeight;
 	static bool mFullscreen;
+	static bool mFitDisplay;
+	static bool mResExplicit;
 	static Logical seeSolids;
 	static CString eggNotationFileName;
 	static CString spoolFileName;
diff --git a/MUNGA_L4/L4APP.cpp b/MUNGA_L4/L4APP.cpp
index 1476fdc..fd4698c 100644
--- a/MUNGA_L4/L4APP.cpp
+++ b/MUNGA_L4/L4APP.cpp
@@ -94,6 +94,8 @@ HINSTANCE L4Application::mhInstance = NULL;
 unsigned int L4Application::mScreenWidth = 800;
 unsigned int L4Application::mScreenHeight = 600;
 bool L4Application::mFullscreen = true;
+bool L4Application::mFitDisplay = false;
+bool L4Application::mResExplicit = false;
 Logical L4Application::seeSolids = False;
 CString L4Application::eggNotationFileName;
 CString L4Application::spoolFileName;
@@ -205,6 +207,7 @@ Logical
 		{
 			mScreenWidth = atoi(W2A(argv[++(*arguement)]));
 			mScreenHeight = atoi(W2A(argv[++(*arguement)]));
+			mResExplicit = true;
 		}
 		else
 		{
@@ -217,18 +220,88 @@ Logical
 		mFullscreen = false;
 	}
 
+	//-------------------------------------------------------------------
+	// -fit: borderless window over the whole monitor, and a render size
+	// picked to match. Spelled out as -windowed-fullscreen too, since
+	// that is what the rest of the world calls it.
+	//-------------------------------------------------------------------
+	else if (
+		!stricmp(W2A(argv[*arguement]), "-fit") ||
+		!stricmp(W2A(argv[*arguement]), "-windowed-fullscreen")
+	)
+	{
+		mFullscreen = false;
+		mFitDisplay = true;
+	}
+
 	else if (
 		!stricmp(W2A(argv[*arguement]), "-h") || !stricmp(W2A(argv[*arguement]), "-help")
 	)
 	{
 		DEBUG_STREAM << "\n" << argv[0] <<
-			" -egg <filename> -net <memory_address> -solids -h -help\n";
+			" -egg <filename> -net <memory_address> -solids -h -help\n"
+			"  -windowed              windowed, title bar and all\n"
+			"  -fit                   borderless over the whole monitor,\n"
+			"                         render size chosen to match\n"
+			"                         (long form: -windowed-fullscreen)\n"
+			"  -res <width> <height>  explicit render size; overrides the\n"
+			"                         size -fit would have picked\n";
 		return False;
 	}
 
 	return True;
 }
 
+//
+//#############################################################################
+// ChooseFitResolution
+//#############################################################################
+//
+// The cockpit presents the 3D into a viewscreen that fills its 1920x1080
+// canvas, and that canvas is fitted to the window at one uniform scale.
+// So the render size that lands 1:1 on screen is the canvas at the same
+// scale the cockpit will choose - work it out with identical arithmetic
+// here and the stretch becomes a copy.
+//
+void
+	L4Application::ChooseFitResolution()
+{
+	int monitor_w = GetSystemMetrics(SM_CXSCREEN);
+	int monitor_h = GetSystemMetrics(SM_CYSCREEN);
+	if (monitor_w <= 0 || monitor_h <= 0)
+	{
+		return;
+	}
+
+	const int canvas_w = 1920;
+	const int canvas_h = 1080;
+
+	int fit_w = (monitor_w * 100) / canvas_w;
+	int fit_h = (monitor_h * 100) / canvas_h;
+	int scale = (fit_w < fit_h) ? fit_w : fit_h;
+	if (scale < 25)	scale = 25;
+
+	unsigned int width = (canvas_w * scale) / 100;
+	unsigned int height = (canvas_h * scale) / 100;
+
+	//-------------------------------------------------------------------
+	// A 1995 engine on a 5K panel would be asked for a back buffer well
+	// past anything it was built for; cap and let D3D scale the last bit.
+	//-------------------------------------------------------------------
+	if (width > 3840)
+	{
+		width = 3840;
+		height = 2160;
+	}
+
+	mScreenWidth = width;
+	mScreenHeight = height;
+
+	DEBUG_STREAM << "L4Application: -fit chose -res " << width << " "
+		<< height << " (" << scale << "% canvas) for the "
+		<< monitor_w << "x" << monitor_h << " monitor\n" << std::flush;
+}
+
 //
 //#############################################################################
 // ParseCommandLine
@@ -270,6 +343,12 @@ Logical
 			}
 		}
 	}
+
+	// after the whole line, so -res wins from either side of -fit
+	if (mFitDisplay && !mResExplicit)
+	{
+		ChooseFitResolution();
+	}
 	return True;
 }
 
diff --git a/MUNGA_L4/L4MFDVIEW.cpp b/MUNGA_L4/L4MFDVIEW.cpp
index c4fe40b..e3fccb4 100644
--- a/MUNGA_L4/L4MFDVIEW.cpp
+++ b/MUNGA_L4/L4MFDVIEW.cpp
@@ -17,9 +17,26 @@ namespace
 	// player actually clicks. Applies to both the MFD strips (depth
 	// measured vertically) and the map's side columns (horizontally).
 	//---------------------------------------------------------------
-	const int buttonDepth = 100;
+	// 240 against the 480 glass: the two banks reach in far enough to
+	// meet in the middle bar the strips' own width, so practically the
+	// whole display is a press target and neither bank overlaps the
+	// other. The clamps below keep that true on a scaled-down cockpit.
+	const int buttonDepth = 240;
 	const int indicatorStrip = 10;
 
+	//---------------------------------------------------------------
+	// The map paints its own legend beside each side button, and that
+	// grid is not the naive height/6: measured off the 640-tall map,
+	// the first cell starts 13 rows down and the six cells are 102
+	// tall on a 105 pitch (13 + 6*102 + 5*3 = 640). Spacing the
+	// buttons evenly from the top instead left every one of them
+	// riding high of its label. Scaled to the live glass height.
+	//---------------------------------------------------------------
+	const int mapLegendSpan = 640;
+	const int mapLegendTop = 13;
+	const int mapLegendCell = 102;
+	const int mapLegendPitch = 105;
+
 	//---------------------------------------------------------------
 	// Button fill colors by lamp brightness (0 off / 1-2 dim / 3
 	// bright), red family for MFD strips, amber for the side columns.
@@ -327,20 +344,28 @@ void
 		if (button_w > limit)		button_w = limit;
 		if (button_w < strip_w)		button_w = strip_w;
 
-		int button_h = display_height / 6;
-
 		displayX = strip_w;
 		*client_width = display_width + 2 * strip_w;
 
 		for (int i = 0; i < 6; ++i)
 		{
-			int h = (i == 5) ? (display_height - 5 * button_h) : button_h;
+			//-------------------------------------------------------
+			// Take top and bottom off the legend grid separately and
+			// subtract: scaling a height directly would let rounding
+			// drift the buttons out of step with the labels.
+			//-------------------------------------------------------
+			int cell_top = mapLegendTop + i * mapLegendPitch;
+			int top = (cell_top * display_height) / mapLegendSpan;
+			int bottom =
+				((cell_top + mapLegendCell) * display_height) / mapLegendSpan;
+			int h = bottom - top;
+			if (h < 1)	h = 1;
 
 			ScreenButton *left = &buttons[buttonCount++];
 			left->unit = anchorA + i;
 			left->amber = 1;
 			left->x = 0;
-			left->y = i * button_h;
+			left->y = top;
 			left->w = button_w;
 			left->h = h;
 
diff --git a/MUNGA_L4/L4VB16.cpp b/MUNGA_L4/L4VB16.cpp
index 7113ce6..2684533 100644
--- a/MUNGA_L4/L4VB16.cpp
+++ b/MUNGA_L4/L4VB16.cpp
@@ -3844,6 +3844,323 @@ static LRESULT CALLBACK
 
 SVGA16 *SVGA16::activeCockpit = NULL;
 
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// The six secondary displays at their pod sizes, in canvas units.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+static const int cockpitMfdBaseW = 320;
+static const int cockpitMfdBaseH = 240;
+// the radar reads best big: 1.35x the compact glass
+// (1.5x proved a touch too large in playtest)
+static const int cockpitRadarBaseW = 324;
+static const int cockpitRadarBaseH = 432;
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// A percentage from the environment, falling back to the given default
+// when the variable is unset, unreadable or nonsense. That fallback is
+// how a per-display setting inherits the group one.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+static int
+	DisplayScalePercent(const char *variable, int fallback)
+{
+	const char *text = getenv(variable);
+	if (text == NULL)
+	{
+		return fallback;
+	}
+
+	int percent = atoi(text);
+	if (percent <= 0)
+	{
+		return fallback;
+	}
+	if (percent < 25)	percent = 25;
+	if (percent > 200)	percent = 200;
+	return percent;
+}
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Shrink a display to fit a limit, uniformly. Clamping one axis alone
+// would stretch the glass out of shape, and these are photographs of
+// real instruments - they have to keep their proportions.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+static void
+	ClampGlass(SVGA16::GlassSize *glass, int max_w, int max_h)
+{
+	if (max_w < 1)	max_w = 1;
+	if (max_h < 1)	max_h = 1;
+
+	if (glass->w > max_w)
+	{
+		glass->h = (glass->h * max_w) / glass->w;
+		glass->w = max_w;
+	}
+	if (glass->h > max_h)
+	{
+		glass->w = (glass->w * max_h) / glass->h;
+		glass->h = max_h;
+	}
+	if (glass->w < 1)	glass->w = 1;
+	if (glass->h < 1)	glass->h = 1;
+}
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Where the radar sits. The pod had it dead centre under the
+// viewscreen, which on a wide panel is exactly where the road is, so
+// L4RADARPOS moves it out of the way: either bottom corner, or halfway
+// up either side.
+//
+// On the bottom row it is one of three panes and the lower MFD whose
+// corner it takes slides inboard beside it. Halfway up a side it leaves
+// the bottom row altogether and sits between that side's two MFDs.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+enum RadarPlacement
+{
+	RadarBottomCenter = 0,
+	RadarBottomLeft,
+	RadarBottomRight,
+	RadarMidLeft,
+	RadarMidRight
+};
+
+static Logical
+	RadarOnASide(RadarPlacement placement)
+{
+	return (placement == RadarMidLeft || placement == RadarMidRight)
+		? True : False;
+}
+
+static Logical
+	RadarOnTheLeft(RadarPlacement placement)
+{
+	return (placement == RadarBottomLeft || placement == RadarMidLeft)
+		? True : False;
+}
+
+static RadarPlacement
+	RadarPosition()
+{
+	static int cached = -1;
+
+	if (cached < 0)
+	{
+		//---------------------------------------------------------------
+		// Two spellings each: the short ones were here first, the long
+		// ones say which edge out loud now that there are five.
+		//---------------------------------------------------------------
+		static const struct
+		{
+			const char *name;
+			int placement;
+		}
+		names[] =
+		{
+			{ "CENTER",			RadarBottomCenter },
+			{ "CENTRE",			RadarBottomCenter },
+			{ "BOTTOM",			RadarBottomCenter },
+			{ "LEFT",			RadarBottomLeft },
+			{ "BOTTOMLEFT",		RadarBottomLeft },
+			{ "RIGHT",			RadarBottomRight },
+			{ "BOTTOMRIGHT",	RadarBottomRight },
+			{ "MIDLEFT",		RadarMidLeft },
+			{ "LEFTCENTER",		RadarMidLeft },
+			{ "LEFTCENTRE",		RadarMidLeft },
+			{ "MIDRIGHT",		RadarMidRight },
+			{ "RIGHTCENTER",	RadarMidRight },
+			{ "RIGHTCENTRE",	RadarMidRight }
+		};
+
+		cached = RadarBottomCenter;
+
+		const char *text = getenv("L4RADARPOS");
+		if (text != NULL)
+		{
+			for (int i = 0; i < (int) (sizeof(names) / sizeof(names[0])); ++i)
+			{
+				if (!stricmp(text, names[i].name))
+				{
+					cached = names[i].placement;
+					break;
+				}
+			}
+		}
+
+		static const char *described[] =
+		{
+			"bottom centre",
+			"bottom left",
+			"bottom right",
+			"left side, centred",
+			"right side, centred"
+		};
+		DEBUG_STREAM << "SVGA16: radar on the " << described[cached]
+			<< "\n" << std::flush;
+	}
+	return (RadarPlacement) cached;
+}
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// The six secondary displays sized for a given canvas scale.
+//
+// The pod bolted these down at fixed sizes; a desktop panel has room to
+// trade viewscreen for instrument, so the player scales them. Each has
+// its own setting, falling back to the group one - L4MFDSCALE sets all
+// five MFDs, L4MFDSCALE_UL and friends override individually, and
+// L4RADARSCALE the radar.
+//
+// Scaling happens in canvas units, before the canvas is fitted to the
+// window, so a given number means the same thing on every monitor.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+void
+	SVGA16::CockpitGlassSizes(int scale, GlassSize sizes[SplitViewCount])
+{
+	static Logical settings_read = False;
+	static int percent[SplitViewCount];
+
+	if (!settings_read)
+	{
+		settings_read = True;
+
+		int group = DisplayScalePercent("L4MFDSCALE", 100);
+		percent[SplitMFDUpperLeft] =
+			DisplayScalePercent("L4MFDSCALE_UL", group);
+		percent[SplitMFDUpperCenter] =
+			DisplayScalePercent("L4MFDSCALE_UC", group);
+		percent[SplitMFDUpperRight] =
+			DisplayScalePercent("L4MFDSCALE_UR", group);
+		percent[SplitMFDLowerLeft] =
+			DisplayScalePercent("L4MFDSCALE_LL", group);
+		percent[SplitMFDLowerRight] =
+			DisplayScalePercent("L4MFDSCALE_LR", group);
+		percent[SplitMap] = DisplayScalePercent("L4RADARSCALE", 100);
+
+		DEBUG_STREAM << "SVGA16: secondary displays at UL "
+			<< percent[SplitMFDUpperLeft] << "% UC "
+			<< percent[SplitMFDUpperCenter] << "% UR "
+			<< percent[SplitMFDUpperRight] << "% LL "
+			<< percent[SplitMFDLowerLeft] << "% LR "
+			<< percent[SplitMFDLowerRight] << "% radar "
+			<< percent[SplitMap] << "%\n" << std::flush;
+	}
+
+	GlassSize glass[SplitViewCount];
+	for (int view = 0; view < SplitViewCount; ++view)
+	{
+		int base_w = (view == SplitMap) ? cockpitRadarBaseW : cockpitMfdBaseW;
+		int base_h = (view == SplitMap) ? cockpitRadarBaseH : cockpitMfdBaseH;
+		glass[view].w = (base_w * percent[view]) / 100;
+		glass[view].h = (base_h * percent[view]) / 100;
+	}
+
+	//-------------------------------------------------------------------
+	// Keep the pod arrangement legal in canvas units. Sizing each
+	// display on its own means these limits can be exact rather than one
+	// conservative rule covering all five: what constrains a display is
+	// its actual neighbour, not the largest a neighbour might have been.
+	//
+	// The panes overlap the viewscreen by design, as the pod's bezels
+	// did - each other, never.
+	//-------------------------------------------------------------------
+	const int canvas_w = 1920;
+	const int canvas_h = 1080;
+	const int half_w = canvas_w / 2;
+
+	// nothing may exceed the canvas on its own
+	for (int view = 0; view < SplitViewCount; ++view)
+	{
+		ClampGlass(&glass[view], canvas_w, canvas_h);
+	}
+
+	//-------------------------------------------------------------------
+	// The radar shares its column with the MFDs above and below it, so
+	// their heights share the canvas. Which MFDs those are, and how much
+	// room they leave, depends on where the radar was put. It yields,
+	// being the one that grows into the view.
+	//-------------------------------------------------------------------
+	RadarPlacement placement = RadarPosition();
+
+	if (RadarOnASide(placement))
+	{
+		//---------------------------------------------------------------
+		// Halfway up a side it has an MFD above AND below, and it grows
+		// from the middle in both directions - so it must clear the
+		// taller of the two twice over. That is a real constraint: two
+		// big MFDs on one side leave a centred radar very little.
+		//---------------------------------------------------------------
+		Logical left = RadarOnTheLeft(placement);
+		int upper = left
+			? glass[SplitMFDUpperLeft].h : glass[SplitMFDUpperRight].h;
+		int lower = left
+			? glass[SplitMFDLowerLeft].h : glass[SplitMFDLowerRight].h;
+		int tallest = (upper > lower) ? upper : lower;
+
+		ClampGlass(&glass[SplitMap], canvas_w, canvas_h - 2 * tallest);
+	}
+	else
+	{
+		//---------------------------------------------------------------
+		// On the bottom edge it only has to clear the MFD hanging from
+		// the top of its column.
+		//---------------------------------------------------------------
+		int above =
+			(placement == RadarBottomLeft)  ? glass[SplitMFDUpperLeft].h :
+			(placement == RadarBottomRight) ? glass[SplitMFDUpperRight].h :
+											  glass[SplitMFDUpperCenter].h;
+		ClampGlass(&glass[SplitMap], canvas_w, canvas_h - above);
+	}
+
+	//-------------------------------------------------------------------
+	// The top row is a centred display with one anchored to either edge,
+	// so a side display gets whatever the centre one leaves of its half.
+	//-------------------------------------------------------------------
+	int top_side = half_w - glass[SplitMFDUpperCenter].w / 2;
+	ClampGlass(&glass[SplitMFDUpperLeft], top_side, canvas_h);
+	ClampGlass(&glass[SplitMFDUpperRight], top_side, canvas_h);
+
+	//-------------------------------------------------------------------
+	// What the bottom row looks like depends on the radar as well:
+	// centred it is the middle of that row, in a corner it is a third
+	// pane along it, and on a side it has left the row entirely and the
+	// two MFDs have the whole bottom edge to share.
+	//-------------------------------------------------------------------
+	if (RadarOnASide(placement))
+	{
+		ClampGlass(&glass[SplitMFDLowerLeft], half_w, canvas_h);
+		ClampGlass(&glass[SplitMFDLowerRight], half_w, canvas_h);
+	}
+	else if (placement == RadarBottomCenter)
+	{
+		int bottom_side = half_w - glass[SplitMap].w / 2;
+		ClampGlass(&glass[SplitMFDLowerLeft], bottom_side, canvas_h);
+		ClampGlass(&glass[SplitMFDLowerRight], bottom_side, canvas_h);
+	}
+	else
+	{
+		int bottom_share = (canvas_w - glass[SplitMap].w) / 2;
+		ClampGlass(&glass[SplitMFDLowerLeft], bottom_share, canvas_h);
+		ClampGlass(&glass[SplitMFDLowerRight], bottom_share, canvas_h);
+	}
+
+	//-------------------------------------------------------------------
+	// An upper and a lower MFD share a column, anchored to opposite
+	// edges, so their heights must not sum past the canvas. The lower
+	// one yields - it is the one the radar sits beside.
+	//-------------------------------------------------------------------
+	ClampGlass(&glass[SplitMFDLowerLeft], canvas_w,
+		canvas_h - glass[SplitMFDUpperLeft].h);
+	ClampGlass(&glass[SplitMFDLowerRight], canvas_w,
+		canvas_h - glass[SplitMFDUpperRight].h);
+
+	//-------------------------------------------------------------------
+	// Only now to device pixels: clamping in canvas units keeps every
+	// limit above independent of the monitor.
+	//-------------------------------------------------------------------
+	for (int view = 0; view < SplitViewCount; ++view)
+	{
+		sizes[view].w = (glass[view].w * scale) / 100;
+		sizes[view].h = (glass[view].h * scale) / 100;
+	}
+}
+
 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 // Fit the 1920x1080 cockpit canvas into the given client area: one
 // uniform scale (so the canvas never stretches - a wider desktop just
@@ -3886,11 +4203,8 @@ void
 			SWP_NOZORDER | SWP_NOACTIVATE);
 	}
 
-	int top_glass_w = (320 * scale) / 100;
-	int top_glass_h = (240 * scale) / 100;
-	// the radar reads best big: 1.35x the compact glass
-	int map_glass_w = (324 * scale) / 100;
-	int map_glass_h = (432 * scale) / 100;
+	GlassSize glass[SplitViewCount];
+	CockpitGlassSizes(scale, glass);
 
 	for (int view = 0; view < SplitViewCount; ++view)
 	{
@@ -3898,14 +4212,7 @@ void
 		{
 			continue;
 		}
-		if (view == SplitMap)
-		{
-			splitView[view]->Resize(map_glass_w, map_glass_h);
-		}
-		else
-		{
-			splitView[view]->Resize(top_glass_w, top_glass_h);
-		}
+		splitView[view]->Resize(glass[view].w, glass[view].h);
 	}
 
 	//---------------------------------------------------------------
@@ -3928,24 +4235,67 @@ void
 			origin_x + view_w - splitView[SplitMFDUpperRight]->ClientWidth(),
 			origin_y);
 	}
+	//---------------------------------------------------------------
+	// The radar: bottom centre, either bottom corner, or halfway up
+	// either side. Only when it takes a bottom corner does a lower MFD
+	// have to move - on a side it is out of that row's way already.
+	//---------------------------------------------------------------
+	RadarPlacement placement = RadarPosition();
+	int radar_w = (splitView[SplitMap] != NULL)
+		? splitView[SplitMap]->ClientWidth() : 0;
+
+	if (splitView[SplitMap] != NULL)
+	{
+		int radar_h = splitView[SplitMap]->ClientHeight();
+		int radar_x, radar_y;
+
+		switch (placement)
+		{
+		case RadarBottomLeft:
+			radar_x = origin_x;
+			radar_y = origin_y + view_h - radar_h;
+			break;
+
+		case RadarBottomRight:
+			radar_x = origin_x + view_w - radar_w;
+			radar_y = origin_y + view_h - radar_h;
+			break;
+
+		case RadarMidLeft:
+			radar_x = origin_x;
+			radar_y = origin_y + (view_h - radar_h) / 2;
+			break;
+
+		case RadarMidRight:
+			radar_x = origin_x + view_w - radar_w;
+			radar_y = origin_y + (view_h - radar_h) / 2;
+			break;
+
+		default:
+			radar_x = origin_x + (view_w - radar_w) / 2;
+			radar_y = origin_y + view_h - radar_h;
+			break;
+		}
+
+		splitView[SplitMap]->SetPosition(radar_x, radar_y);
+	}
+
+	int slide_left = (placement == RadarBottomLeft) ? radar_w : 0;
+	int slide_right = (placement == RadarBottomRight) ? radar_w : 0;
+
 	if (splitView[SplitMFDLowerLeft] != NULL)
 	{
 		splitView[SplitMFDLowerLeft]->SetPosition(
-			origin_x,
+			origin_x + slide_left,
 			origin_y + view_h - splitView[SplitMFDLowerLeft]->ClientHeight());
 	}
 	if (splitView[SplitMFDLowerRight] != NULL)
 	{
 		splitView[SplitMFDLowerRight]->SetPosition(
-			origin_x + view_w - splitView[SplitMFDLowerRight]->ClientWidth(),
+			origin_x + view_w - splitView[SplitMFDLowerRight]->ClientWidth()
+				- slide_right,
 			origin_y + view_h - splitView[SplitMFDLowerRight]->ClientHeight());
 	}
-	if (splitView[SplitMap] != NULL)
-	{
-		splitView[SplitMap]->SetPosition(
-			origin_x + (view_w - splitView[SplitMap]->ClientWidth()) / 2,
-			origin_y + view_h - splitView[SplitMap]->ClientHeight());
-	}
 
 	// The panes go OVER the main display (pod bezel occlusion): pin
 	// the viewscreen to the bottom of the sibling z-order so the 3D
@@ -4023,35 +4373,67 @@ SVGA16::SVGA16(
 		int work_w = work.right - work.left;
 		int work_h = work.bottom - work.top;
 
-		int mid_x    = (work_w - init_width) / 2;   if (mid_x < 0)    mid_x = 0;
-		int right_x  =  work_w - init_width;         if (right_x < 0)  right_x = 0;
-		int bottom_y =  work_h - init_height;        if (bottom_y < 0) bottom_y = 0;
-
+		//---------------------------------------------------------------
+		// Each display carries its own button bank here too, at native
+		// size: the banks reach under the glass with their indicator
+		// strips clearing the edge, exactly as in the composited
+		// cockpit - so the buttons can be read and pressed full size.
+		//---------------------------------------------------------------
 		splitView[SplitMFDUpperLeft] = new MFDSplitView(
 			"MFD upper left", init_width, init_height,
 			init_width, init_height, work.left, work.top,
-			MFDSplitView::NoButtons, 0, 0, 0);
+			MFDSplitView::MFDStrips, 0x2F, 0, 0);
 		splitView[SplitMFDUpperCenter] = new MFDSplitView(
 			"MFD upper center", init_width, init_height,
-			init_width, init_height, work.left + mid_x, work.top,
-			MFDSplitView::NoButtons, 0, 0, 0);
+			init_width, init_height, work.left, work.top,
+			MFDSplitView::MFDStrips, 0x27, 0, 0);
 		splitView[SplitMFDUpperRight] = new MFDSplitView(
 			"MFD upper right", init_width, init_height,
-			init_width, init_height, work.left + right_x, work.top,
-			MFDSplitView::NoButtons, 0, 0, 0);
+			init_width, init_height, work.left, work.top,
+			MFDSplitView::MFDStrips, 0x37, 0, 0);
 		splitView[SplitMFDLowerLeft] = new MFDSplitView(
 			"MFD lower left", init_width, init_height,
-			init_width, init_height, work.left, work.top + bottom_y,
-			MFDSplitView::NoButtons, 0, 0, 0);
+			init_width, init_height, work.left, work.top,
+			MFDSplitView::MFDStrips, 0x0F, 0, 0);
 		splitView[SplitMFDLowerRight] = new MFDSplitView(
 			"MFD lower right", init_width, init_height,
-			init_width, init_height, work.left + right_x, work.top + bottom_y,
-			MFDSplitView::NoButtons, 0, 0, 0);
+			init_width, init_height, work.left, work.top,
+			MFDSplitView::MFDStrips, 0x07, 0, 0);
 		// map is portrait-mounted: source rotated to 480x640
 		splitView[SplitMap] = new MFDSplitView(
 			"Map", init_height, init_width,
-			init_height, init_width, work.left + mid_x, work.top + bottom_y,
-			MFDSplitView::NoButtons, 0, 0, 0);
+			init_height, init_width, work.left, work.top,
+			MFDSplitView::SideColumns, 0x10, 0x18, 0);
+
+		//---------------------------------------------------------------
+		// Lay them out in the pod arrangement from their measured sizes
+		// (the banks make each window bigger than its glass).
+		//---------------------------------------------------------------
+		RECT probe;
+		probe.left = 0; probe.top = 0; probe.right = 100; probe.bottom = 100;
+		AdjustWindowRect(&probe,
+			WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX, FALSE);
+		int chrome_w = (probe.right - probe.left) - 100;
+		int chrome_h = (probe.bottom - probe.top) - 100;
+
+		int mfd_w = splitView[SplitMFDUpperLeft]->ClientWidth() + chrome_w;
+		int mfd_h = splitView[SplitMFDUpperLeft]->ClientHeight() + chrome_h;
+		int map_w = splitView[SplitMap]->ClientWidth() + chrome_w;
+		int map_h = splitView[SplitMap]->ClientHeight() + chrome_h;
+
+		int mid_x    = (work_w - mfd_w) / 2;	if (mid_x < 0)    mid_x = 0;
+		int right_x  =  work_w - mfd_w;			if (right_x < 0)  right_x = 0;
+		int bottom_y =  work_h - mfd_h;			if (bottom_y < 0) bottom_y = 0;
+		int map_x    = (work_w - map_w) / 2;	if (map_x < 0)    map_x = 0;
+		int map_y    =  work_h - map_h;			if (map_y < 0)    map_y = 0;
+
+		splitView[SplitMFDUpperLeft]->SetPosition(work.left, work.top);
+		splitView[SplitMFDUpperCenter]->SetPosition(work.left + mid_x, work.top);
+		splitView[SplitMFDUpperRight]->SetPosition(work.left + right_x, work.top);
+		splitView[SplitMFDLowerLeft]->SetPosition(work.left, work.top + bottom_y);
+		splitView[SplitMFDLowerRight]->SetPosition(
+			work.left + right_x, work.top + bottom_y);
+		splitView[SplitMap]->SetPosition(work.left + map_x, work.top + map_y);
 	}
 	else if (splitViews)
 	{
@@ -4073,8 +4455,20 @@ SVGA16::SVGA16(
 
 		HWND cockpit = ApplicationManager::GetCurrentManager()->GetHWnd();
 
+		//---------------------------------------------------------------
+		// -fit takes the whole monitor rather than the work area, and
+		// pays no chrome: the shell goes borderless below. Otherwise
+		// stay inside the work area so the taskbar is still reachable.
+		//---------------------------------------------------------------
+		bool fit_display = L4Application::GetFitDisplay();
+
 		int chrome_w = 16, chrome_h = 40;
-		if (cockpit != NULL)
+		if (fit_display)
+		{
+			chrome_w = 0;
+			chrome_h = 0;
+		}
+		else if (cockpit != NULL)
 		{
 			RECT outer, inner;
 			GetWindowRect(cockpit, &outer);
@@ -4085,7 +4479,28 @@ SVGA16::SVGA16(
 
 		RECT work;
 		work.left = 0; work.top = 0; work.right = 1920; work.bottom = 1080;
-		SystemParametersInfoA(SPI_GETWORKAREA, 0, &work, 0);
+		if (fit_display)
+		{
+			MONITORINFO monitor;
+			memset(&monitor, 0, sizeof(monitor));
+			monitor.cbSize = sizeof(monitor);
+			HMONITOR handle = MonitorFromWindow(
+				(cockpit != NULL) ? cockpit : GetDesktopWindow(),
+				MONITOR_DEFAULTTOPRIMARY);
+			if (GetMonitorInfoA(handle, &monitor))
+			{
+				work = monitor.rcMonitor;
+			}
+			else
+			{
+				work.right = GetSystemMetrics(SM_CXSCREEN);
+				work.bottom = GetSystemMetrics(SM_CYSCREEN);
+			}
+		}
+		else
+		{
+			SystemParametersInfoA(SPI_GETWORKAREA, 0, &work, 0);
+		}
 		int avail_w = (work.right - work.left) - chrome_w;
 		int avail_h = (work.bottom - work.top) - chrome_h;
 
@@ -4115,12 +4530,35 @@ SVGA16::SVGA16(
 		//---------------------------------------------------------------
 		if (cockpit != NULL)
 		{
-			SetWindowLongPtrA(cockpit, GWL_STYLE,
-				GetWindowLongPtrA(cockpit, GWL_STYLE) | WS_CLIPCHILDREN);
+			LONG_PTR style = GetWindowLongPtrA(cockpit, GWL_STYLE);
 
-			SetWindowPos(cockpit, NULL, work.left, work.top,
-				client_w + chrome_w, client_h + chrome_h,
-				SWP_NOZORDER | SWP_NOACTIVATE | SWP_FRAMECHANGED);
+			if (fit_display)
+			{
+				//-------------------------------------------------------
+				// Borderless over the whole monitor. The window is the
+				// full panel, wider than 16:9 or not - LayoutCockpit
+				// centres the canvas inside it and the leftover stays
+				// black, so this letterboxes exactly like a resize.
+				//-------------------------------------------------------
+				style &= ~(WS_CAPTION | WS_THICKFRAME | WS_SYSMENU |
+					WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_BORDER |
+					WS_DLGFRAME);
+				style |= WS_POPUP | WS_CLIPCHILDREN;
+				SetWindowLongPtrA(cockpit, GWL_STYLE, style);
+
+				SetWindowPos(cockpit, NULL, work.left, work.top,
+					work.right - work.left, work.bottom - work.top,
+					SWP_NOZORDER | SWP_NOACTIVATE | SWP_FRAMECHANGED);
+			}
+			else
+			{
+				SetWindowLongPtrA(cockpit, GWL_STYLE,
+					style | WS_CLIPCHILDREN);
+
+				SetWindowPos(cockpit, NULL, work.left, work.top,
+					client_w + chrome_w, client_h + chrome_h,
+					SWP_NOZORDER | SWP_NOACTIVATE | SWP_FRAMECHANGED);
+			}
 		}
 
 		//---------------------------------------------------------------
@@ -4161,40 +4599,34 @@ SVGA16::SVGA16(
 		//   0x37.. / lower left 0x0F.. / lower right 0x07.. and the map
 		//   flanked by Secondary 0x10-0x15 / Screen 0x18-0x1D.
 		//---------------------------------------------------------------
-		// all five MFDs at the compact size, corners + top center
-		int top_glass_w = COCKPIT_CANVAS(320);
-		int top_glass_h = COCKPIT_CANVAS(240);
-		int bot_glass_w = COCKPIT_CANVAS(320);
-		int bot_glass_h = COCKPIT_CANVAS(240);
-		// the radar reads best big: 1.35x the compact glass
-		// (1.5x proved a touch too large in playtest)
-		int map_glass_w = COCKPIT_CANVAS(324);
-		int map_glass_h = COCKPIT_CANVAS(432);
+		// each display at whatever the player asked for it
+		GlassSize glass[SplitViewCount];
+		CockpitGlassSizes(scale_num, glass);
 
 		splitView[SplitMFDUpperLeft] = new MFDSplitView(
 			"MFD upper left", init_width, init_height,
-			top_glass_w, top_glass_h, 0, 0,
+			glass[SplitMFDUpperLeft].w, glass[SplitMFDUpperLeft].h, 0, 0,
 			MFDSplitView::MFDStrips, 0x2F, 0, cockpit);
 		splitView[SplitMFDUpperCenter] = new MFDSplitView(
 			"MFD upper center", init_width, init_height,
-			top_glass_w, top_glass_h, 0, 0,
+			glass[SplitMFDUpperCenter].w, glass[SplitMFDUpperCenter].h, 0, 0,
 			MFDSplitView::MFDStrips, 0x27, 0, cockpit);
 		splitView[SplitMFDUpperRight] = new MFDSplitView(
 			"MFD upper right", init_width, init_height,
-			top_glass_w, top_glass_h, 0, 0,
+			glass[SplitMFDUpperRight].w, glass[SplitMFDUpperRight].h, 0, 0,
 			MFDSplitView::MFDStrips, 0x37, 0, cockpit);
 		splitView[SplitMFDLowerLeft] = new MFDSplitView(
 			"MFD lower left", init_width, init_height,
-			bot_glass_w, bot_glass_h, 0, 0,
+			glass[SplitMFDLowerLeft].w, glass[SplitMFDLowerLeft].h, 0, 0,
 			MFDSplitView::MFDStrips, 0x0F, 0, cockpit);
 		splitView[SplitMFDLowerRight] = new MFDSplitView(
 			"MFD lower right", init_width, init_height,
-			bot_glass_w, bot_glass_h, 0, 0,
+			glass[SplitMFDLowerRight].w, glass[SplitMFDLowerRight].h, 0, 0,
 			MFDSplitView::MFDStrips, 0x07, 0, cockpit);
 		// map is portrait: source rotated 90 degrees clockwise
 		splitView[SplitMap] = new MFDSplitView(
 			"Map", init_height, init_width,
-			map_glass_w, map_glass_h, 0, 0,
+			glass[SplitMap].w, glass[SplitMap].h, 0, 0,
 			MFDSplitView::SideColumns, 0x10, 0x18, cockpit);
 
 		//---------------------------------------------------------------
diff --git a/pack-dist.ps1 b/pack-dist.ps1
index 332fa1c..c188aea 100644
--- a/pack-dist.ps1
+++ b/pack-dist.ps1
@@ -144,6 +144,56 @@ L4PLASMA=SCREEN
 # 480x640 - decoded exactly as the pod's VDB split them, no downscale).
 L4MFDSPLIT=1
 
+# Size of the six secondary displays in the glass cockpit, as a
+# percentage of their pod size. The pod bolted them down at one size;
+# on a big panel there is room to trade viewscreen for instrument, so
+# turn these up if you want to actually read the other displays while
+# you fly. 100 = as the pod had them. Range 25-200 (out-of-range and
+# unreadable values fall back to the group setting, then to 100).
+#
+# The scaling is applied in canvas units, before the cockpit is fitted
+# to your window, so a given number looks the same on every monitor.
+# The layout stays legal whatever you ask for - the panes are clamped
+# against their actual neighbours, shrinking uniformly so a display
+# never comes out stretched. They do overlap the viewscreen, exactly
+# as the pod's bezels did, but never each other.
+#
+# L4MFDSCALE sets all five green MFDs at once.
+L4MFDSCALE=100
+
+# ...and any single display can override it. Uncomment one to size it
+# on its own - useful if you only care about, say, the damage readout.
+#   UL upper left     UC upper center    UR upper right
+#   LL lower left     LR lower right
+#L4MFDSCALE_UL=100
+#L4MFDSCALE_UC=100
+#L4MFDSCALE_UR=100
+#L4MFDSCALE_LL=100
+#L4MFDSCALE_LR=100
+
+# The portrait radar/map, sized on its own (it already sits at 1.35x
+# the MFDs by default). It shares the canvas with whichever MFD is
+# above it, so at extreme settings one of the two gives way.
+L4RADARSCALE=100
+
+# Where the radar sits:
+#   CENTER    bottom centre, under the viewscreen, as the pod had it
+#             (default; BOTTOM and CENTRE mean the same)
+#   LEFT      bottom left corner      (or BOTTOMLEFT)
+#   RIGHT     bottom right corner     (or BOTTOMRIGHT)
+#   MIDLEFT   left edge, halfway up   (or LEFTCENTER / LEFTCENTRE)
+#   MIDRIGHT  right edge, halfway up  (or RIGHTCENTER / RIGHTCENTRE)
+# Anywhere but CENTER stops it blocking the middle of the road, which
+# is worth having on a wide screen.
+#
+# In a bottom corner it is one of three panes along the bottom, and the
+# lower MFD whose corner it takes slides inboard beside it. Halfway up
+# a side it leaves the bottom row entirely and sits between that side's
+# two MFDs - roomy on a tall radar, but if the MFDs on that side are
+# also scaled up, the radar is the one that gives way (it has to clear
+# both of them, and it grows from the middle in both directions).
+L4RADARPOS=CENTER
+
 # Simulation/render frame rate, integer frames/second. The desktop
 # default is 60; the arcade pods shipped at 25.
 TARGETFPS=60
@@ -243,12 +293,24 @@ cd /d "%~dp0"
 start rpl4opt.exe -windowed -res 1920 1080
 "@
 
+Set-Content -Path "$dist\start-fullscreen.bat" -Encoding ascii -Value @"
+@echo off
+rem Red Planet 4.12 - borderless over the whole monitor. -fit sizes the
+rem window to the panel AND picks the render size to match the cockpit
+rem canvas it lands in, so no -res guessing: the 3D arrives 1:1 instead
+rem of being stretched. Pass -res yourself to override it.
+rem (Add -egg TEST.EGG to skip the menu and run the canned mission.)
+cd /d "%~dp0"
+start rpl4opt.exe -fit
+"@
+
 Set-Content -Path "$dist\README.txt" -Encoding ascii -Value @"
 Red Planet 4.12.2
 =================
 
-Run start-windowed.bat (or: rpl4opt.exe -windowed -res 800 600 -egg TEST.EGG).
-No cockpit hardware needed. If there is no sound, run oalinst.exe once.
+Run start-fullscreen.bat for borderless over the whole monitor, or
+start-windowed.bat to keep a title bar. No cockpit hardware needed.
+If there is no sound, run oalinst.exe once.
 
 Controls (XInput controller and/or keyboard) - EVERY input is
 rebindable: edit bindings.txt beside the exe (written with the full
@@ -268,8 +330,19 @@ documented default layout on first run; delete it to restore).
 
 The cockpit scales to whatever window you give it - maximise it and it
 grows, keeping its 16:9 shape (an ultrawide gets black bars rather than
-a stretched cockpit). The 3D itself renders at whatever -res says, so
-on a big screen raise it to match: rpl4opt.exe -windowed -res 2560 1440.
+a stretched cockpit).
+
+The 3D itself renders at whatever -res says and is then stretched onto
+the cockpit's viewscreen, so a mismatched -res costs sharpness. -fit
+takes care of that for you: it measures the monitor, works out the
+canvas the cockpit will settle on, and asks for exactly that render
+size, so the picture arrives 1:1.
+
+  rpl4opt.exe -fit                    borderless, res chosen for you
+  rpl4opt.exe -fit -res 1280 720      same window, lighter render
+  rpl4opt.exe -windowed -res 2560 1440  pick both yourself
+
+(-windowed-fullscreen is accepted as a long spelling of -fit.)
 
 The full pod cockpit comes up in a single window: three green MFDs
 across the top, the 3D viewscreen centered with the orange plasma glass