//!OpenSCAD

difference() {
  cube([19, 35, 4], center=false);

  translate([1, 1, 2]){
    cube([8, 8, 2], center=false);
  }
  translate([1, 10, 2]){
    cube([8, 8, 2], center=false);
  }
  translate([10, 1, 2]){
    cube([8, 8, 2], center=false);
  }
  translate([10, 10, 2]){
    cube([8, 8, 2], center=false);
  }
  translate([1, 19, 2]){
    cube([8, 15, 2], center=false);
  }
}
translate([9, 18, 0]){
  difference() {
    cube([10, 17, 10], center=false);

    for (i = [0 : abs(1) : 2]) {
      desp = 2;
      translate([(desp + i * 3), 2, 0]){
        cylinder(r1=1, r2=1, h=10, center=false);
      }
    }

    for (i = [0 : abs(1) : 2]) {
      desp = 2;
      translate([(desp + i * 3), 6, 0]){
        cylinder(r1=1.2, r2=1.2, h=10, center=false);
      }
    }

    for (i = [0 : abs(1) : 1]) {
      desp = 3;
      translate([(desp + i * 4), 10, 0]){
        cylinder(r1=1.5, r2=1.5, h=10, center=false);
      }
    }

    translate([5, 14, 0]){
      cylinder(r1=2, r2=2, h=10, center=false);
    }
  }
}