Add models for rough dimensions of pieces

model/dimensions.scad

@@ -0,0 +1,18 @@
+module main_display(){
+    // Outer dimensions (incl. PCB), height currently unknown
+    cube([55.04, 89.3, 10]);
+}
+
+module pad(){
+    // A button has 4.2 x 6 mm -> At least ~20x20 are required for the PCB
+    cube([20, 20, 10]);
+}
+
+module small_display_below_main()
+{
+    // Outer dimensions (incl. PCB)
+    // https://de.aliexpress.com/item/1005005473564682.html#nav-specification
+    cube([43.5, 19.44, 4.5]);
+}
+
+#small_display_below_main();