diff --git a/layout.yml b/layout.yml
new file mode 100644
index 0000000..30e0b4b
--- /dev/null
+++ b/layout.yml
@@ -0,0 +1,51 @@
+meta:
+  engine: 4.2.1
+  name: alpheus
+units:
+  # Matches key_size in the original OpenSCAD.
+  kx: 19
+  ky: 19
+points:
+  zones:
+    matrix:
+      anchor:
+        - shift: [1, 0]
+          rotate: 10
+        - shift: [1.5kx, -0.5ky]
+      key:
+        spread: kx
+        padding: ky
+      columns:
+        col0:
+          rows.mod.skip: true
+        col1.key.stagger: 5
+        col2.key.stagger: 6
+        col3.key.stagger: -5
+        col4.key.stagger: -6
+      rows:
+        mod:
+        bottom:
+        home:
+        top:
+    thumb:
+      anchor:
+        ref: matrix_col0_bottom
+        shift: [-kx, -ky]
+      key:
+        spread: kx
+        height: 1.5ky-1
+      columns:
+        inner:
+        outer.key.stagger: -0.25ky
+      rows:
+        cluster:
+  mirror:
+    distance: 0
+outlines:
+  caps:
+    - what: rectangle
+      where: /matrix/
+      size: [kx-1, ky-1]
+    - what: rectangle
+      where: /thumb/
+      size: [kx-1, 1.5ky-1]
\ No newline at end of file