eps = 0.01;
infty = 200;

body_l = 80;
screw_dist = 47.5;
body_w = 15;
body_h = 20;
screw_hole = 3.5;
screw_head = 9;
screw_h = 5;
side_d = body_h;
side_y = 15;

difference() {
	translate([-body_l/2, -body_w/2, 0])
		cube([body_l, body_w, body_h]);
	// screw holes
	for (x = [-screw_dist/2, screw_dist/2]) {
		translate([x, 0, -eps])
			cylinder(r = screw_hole/2, h = body_h + 2*eps);
		translate([x, 0, screw_h])
			cylinder(r = screw_head/2, h = body_h);
	}
	// sides
	for (y = [-side_y, side_y]) translate([-body_l/2-eps, y, body_h/2])
		rotate([0, 90, 0]) cylinder(r = side_d/2, h = body_l+2*eps);
}