--- /dev/null
+len = 54.3 - 1;
+bigdep = 10.7 - 1;
+smalldep= 4.9 - 1;
+tallw1 = 3.5 - 1.5;
+tallw2 = 3.5 - 1.5; // ish
+totalw = 11.6 - 2;
+
+gapw = totalw - tallw1 - tallw2;
+
+difference() {
+ cube([len, totalw, bigdep]);
+ translate([-1, tallw2, smalldep])
+ cube([len+2, gapw, bigdep - smalldep + 1]);
+}