thickness=4;
depth=85 + 2*thickness;
width=165 + 2*thickness;
height=50 + thickness;

off=10;
hole_dist=15;

module wall() {
    cube([thickness, depth, height]);

    translate([0,0,height])
    difference() {
        hull() {
            cube([thickness, depth, thickness]);

            translate([-off, depth/2-hole_dist, 0])
            cylinder(h=thickness, d=5, $fn=64);
            translate([-off, depth/2+hole_dist, 0])
            cylinder(h=thickness, d=5, $fn=64);
        }

        translate([-off, depth/2-hole_dist, 0])
        cylinder(h=thickness, d=2, $fn=64);
        translate([-off, depth/2+hole_dist, 0])
        cylinder(h=thickness, d=2, $fn=64);

        translate([-off, depth/2-hole_dist, 0])
        cylinder(h=2, d=4, $fn=64);
        translate([-off, depth/2+hole_dist, 0])
        cylinder(h=2, d=4, $fn=64);
    }
}

// sides
difference() {
    wall();

    translate([0, depth/2, height/2])
    cube([10, 65, 40], center=true);
}

translate([width, 0, 0])
mirror([1,0,0])
wall();

// base
cube([width, depth, thickness]);

module wall2() {
    difference() {
        cube([width, thickness, 10]);

        translate([37.5+thickness, 6, 4+thickness])
        rotate([90,0,0])
        cylinder(h=4, d=6, $fn=64);

        translate([127.5+thickness, 6, 4+thickness])
        rotate([90,0,0])
        cylinder(h=4, d=6, $fn=64);
    }
}

wall2();

translate([0, depth, 0])
mirror([0,1,0])
wall2();