$fn=60;

include <BOSL2/std.scad>

difference() {
    union() {
        back_half() torus(d_maj=25, d_min=10);
    cuboid([30,18,3], rounding=1.5,  edges=[FWD+RIGHT,FWD+LEFT,BACK+RIGHT,BACK+LEFT]);
        translate([-12.5,-5,0]) ycyl(d=10, l=10, rounding1=1);
        translate([12.5,-5,0]) ycyl(d=10, l=10, rounding1=1);
    }
    translate([0,-8,0]) cuboid([15,15,4], rounding=4, edges=[FWD+RIGHT,FWD+LEFT,BACK+RIGHT,BACK+LEFT]);
    back_half() torus(d_maj=25, d_min=5);
    translate([-12.5,-5,0]) ycyl(d=5, l=10, rounding1=-1);
    translate([12.5,-5,0]) ycyl(d=5, l=10, rounding1=-1);
}