!rotate([180, 0, 0])
	TopHalf();
BottomHalf();

module TopHalf() {
translate([0,0,30]	)
	difference() 	{
			translate([-50, -50, 0.1])
				cube([100,100,28]);
			import("octopus2.stl");
			translate([-50.5, -50.5, -18])
				cube([101,101,30]);
			}
	// registration pegs
	translate([ 40,  40, 36]) 
		cylinder(h=6, r1=1, r2=5,$fn=100);
	translate([-40,  40, 36]) 
		cylinder(h=6, r1=1, r2=5,$fn=100);
	translate([ 40, -40, 36]) 
		cylinder(h=6, r1=1, r2=5,$fn=100);
	translate([-40, -40, 36]) 
		cylinder(h=6, r1=1, r2=5,$fn=100);
	}

module BottomHalf() {
	difference() {
		translate([-50, -50, 0.1])
			cube([100,100,30]);
		import("octopus2.stl");
		translate([0,0,-.1])
			cylinder(h=3, r=12); // remove magnet hole
		translate([-50.5, -50.5, 12])
			cube([101,101,30]);
		// registration holes
		translate([ 40,  40, 6.1]) 
			cylinder(h=6, r1=1, r2=5,$fn=100);
		translate([-40,  40, 6.1]) 
			cylinder(h=6, r1=1, r2=5,$fn=100);
		translate([ 40, -40, 6.1]) 
			cylinder(h=6, r1=1, r2=5,$fn=100);
		translate([-40, -40, 6.1]) 
			cylinder(h=6, r1=1, r2=5,$fn=100);
		}
	}