diff --git a/README.md b/README.md
index 54a3fd2..577cce7 100644
--- a/README.md
+++ b/README.md
@@ -77,7 +77,7 @@ Applied, and verified to be the only differences from the stock jar:
 - `harness/src/spike/` — `HostForHuman` (server + bot, one slot open for a
   human), `WatchGame` + `TextRenderer` (observer client dumping full text state;
   the adapter-pattern prototype)
-- `spike-webswing/` — Webswing config template and `start.sh`
+- `spike-webswing/` — Webswing + MegaMek settings templates, `start.sh`
 - `patches/` — patchset, archive, patched-jar builder
 - `scripts/` — `fetch-deps.sh`, `gen-fontconfig.sh` (legacy fontconfig Webswing's
   toolkit needs), `cdp-screenshot.py`, `summarize.py`
diff --git a/TODO.md b/TODO.md
index 959910b..ba7aa70 100644
--- a/TODO.md
+++ b/TODO.md
@@ -22,8 +22,21 @@ between them — basic punctuation (`/ : ,` parens) turns to boxes and the armor
 pips disappear. Also ruled out earlier: trusting MegaMek's `data/fonts` alone,
 which removed all font-load rejections but fixed nothing.
 
-**Open fullscreen** — the frame opens small inside a large viewport. Webswing
-already passes `webswing.screenWidth`/`screenHeight` to the app JVM.
+**Startup layout — done, one gap.** `spike-webswing/clientsettings.xml.template`
+is seeded into `mmconf/` on every launch (MegaMek rewrites it on exit, so once is
+not enough). Fullscreen works without hardcoding a resolution: a huge stored
+window size is clamped by `UIUtil.updateWindowBounds()` to the screen union,
+which under Webswing is the browser viewport. The unit display is docked
+(`UnitDisplayLocation=1`), the keybinds overlay is off to reclaim map area, and
+the minimap is nudged clear of the left panel.
+
+*The minimap cannot dock* — unlike the unit display and mini report it has no
+location preference and is dialog-only. Docking it would need a MegaMek patch.
+
+*Unverified:* the mini report is set to dock (`MiniReportLocation=1`, the same
+0=float/1=dock mechanism as the unit display) but only appears in report phases,
+which a headless run cannot reach — no shipped scenario pre-places units, so
+deployment always blocks. Confirm during a real match.
 
 **Victory drops you** — the host prints a result, sleeps 5s, then kills
 everything, so the page dies with no summary. Decouple "game over" from "process
diff --git a/spike-webswing/clientsettings.xml.template b/spike-webswing/clientsettings.xml.template
new file mode 100644
index 0000000..1b569ac
--- /dev/null
+++ b/spike-webswing/clientsettings.xml.template
@@ -0,0 +1,48 @@
+<?xml version="1.0"?>
+<!--
+  Seeded into MegaMek's mmconf/ by start.sh before every launch.
+
+  MegaMek rewrites this file on exit (AbstractClientGUI.saveSettings stores the
+  actual window geometry), so it has to be re-seeded each run rather than set
+  once.
+
+  Fullscreen: AbstractClientGUI.initializeFrame() uses the stored size when
+  WindowSizeHeight != 0, and UIUtil.updateWindowBounds() then clamps that size to
+  the union of screen device bounds. Under Webswing the "screen" is the browser
+  viewport, so an absurdly large stored size collapses to exactly the viewport,
+  at 0,0. That avoids hardcoding any resolution.
+
+  Docking: UnitDisplayLocation / MiniReportLocation are 0 = floating dialog,
+  1 = docked into the main split pane (ClientGUI.setUnitDisplayLocation). The
+  minimap has no equivalent preference - it is dialog-only.
+-->
+<MegaMekSettings>
+    <store name="ClientSettings"/>
+    <store name="UnitDisplayOrderPreferences"/>
+    <store name="ButtonOrderPreferences"/>
+    <store name="GUIPreferences">
+        <preference name="WindowPosX" value="0"/>
+        <preference name="WindowPosY" value="0"/>
+        <preference name="WindowSizeWidth" value="20000"/>
+        <preference name="WindowSizeHeight" value="20000"/>
+
+        <preference name="UnitDisplayEnabled" value="true"/>
+        <preference name="UnitDisplayLocation" value="1"/>
+        <preference name="MiniReportEnabled" value="true"/>
+        <preference name="MiniReportLocation" value="1"/>
+        <preference name="DockOnLeft" value="true"/>
+        <preference name="DockMultipleOnYAxis" value="true"/>
+
+        <!-- The minimap has no location preference - it is dialog-only and always
+             floats. At 0,0 it sits on top of the docked unit display and the window
+             title bar, so nudge it clear of the left panel. -->
+        <preference name="MinimapEnabled" value="true"/>
+        <preference name="MinimapPosX" value="320"/>
+        <preference name="MinimapPosY" value="40"/>
+
+        <!-- Reclaim map area. Both overlays are toggleable in-game (Ctrl+K / Ctrl+P). -->
+        <preference name="ShowKeybindsOverlay" value="false"/>
+
+        <preference name="PlayerListEnabled" value="false"/>
+    </store>
+</MegaMekSettings>
diff --git a/spike-webswing/start.sh b/spike-webswing/start.sh
index 10fa424..8e6e9f6 100755
--- a/spike-webswing/start.sh
+++ b/spike-webswing/start.sh
@@ -53,6 +53,10 @@ fi
 # Materialise the Webswing config with absolute paths for this checkout.
 sed "s|@ROOT@|$ROOT|g" "$ROOT/spike-webswing/webswing.config.template" > "$WS/webswing.config"
 
+# Seed MegaMek's GUI preferences: fullscreen frame, docked unit display and
+# report pane. MegaMek rewrites this file on exit, so re-seed every launch.
+cp "$ROOT/spike-webswing/clientsettings.xml.template" "$MM/mmconf/clientsettings.xml"
+
 WS_PID=""
 HOST_PID=""
 TAIL_PID=""