--- /dev/null
+// -*- C -*-
+
+frameth=0.8;
+
+l0= 0.425;
+l1= 0.25;
+
+del=l0+l1*2;
+
+for (r=[0,90,180,270])
+ rotate([0,0,r])
+ translate([10,-(10+frameth),0])
+ cube([frameth, 20+2*frameth, 0.4]);
+
+translate([-11,-11,0])
+cube([2,2, del + l1]);
+
+translate([-3,-3, del])
+ cube([6,6, l1*2]);