color ([0.8, 0.8, 0.8, ]) {
  union () {
    difference () {
      cube ([40, 24.5, 4], center=true);
      translate ([0, 0, 2]) {
        cube ([36, 20.5, 4], center=true);
      }
      translate ([-1.5, 2, 0]) {
        cube ([30, 13.5, 7], center=true);
      }
      translate ([-20, 2, 2]) {
        cube ([5, 10, 4], center=true);
      }
      translate ([-1.5, -14, 1]) {
        cube ([31, 14, 10], center=true);
      }
      translate ([21, -5.75, 1]) {
        cube ([10, 9, 7], center=true);
      }
      translate ([21, -5.75, 1]) {
        cube ([16, 9, 4], center=true);
      }
    }
    scale ([0.75, 0.75, 0.75]) {
      translate ([-31.5, -10, -0.7]) {
        rotate (a=90.0, v=[0, 0, -1]) {
          difference () {
            cube ([10, 10, 4], center=true);
            translate ([0, -0.5, 0]) {
              cylinder (h=7, r=3, center=true);
            }
            translate ([0, -1.5, 3]) {
              cube ([6.75, 9, 7], center=true);
            }
            translate ([0, -2, 3]) {
              rotate (a=14.999999999999998, v=[1, 0, 0]) {
                cube ([12, 15, 4], center=true);
              }
            }
          }
        }
      }
    }
    scale ([0.75, 0.75, 0.75]) {
      translate ([31.5, 8, -0.7]) {
        rotate (a=90.0, v=[0, 0, 1]) {
          difference () {
            cube ([10, 10, 4], center=true);
            translate ([0, -0.5, 0]) {
              cylinder (h=7, r=3, center=true);
            }
            translate ([0, -1.5, 3]) {
              cube ([6.75, 9, 7], center=true);
            }
            translate ([0, -2, 3]) {
              rotate (a=14.999999999999998, v=[1, 0, 0]) {
                cube ([12, 15, 4], center=true);
              }
            }
          }
        }
      }
    }
    scale ([0.75, 0.75, 0.75]) {
      translate ([-15, 21, -0.7]) {
        rotate (a=180.0, v=[0, 0, 1]) {
          difference () {
            cube ([10, 10, 4], center=true);
            translate ([0, -0.5, 0]) {
              cylinder (h=7, r=3, center=true);
            }
            translate ([0, -1.5, 3]) {
              cube ([6.75, 9, 7], center=true);
            }
            translate ([0, -2, 3]) {
              rotate (a=14.999999999999998, v=[1, 0, 0]) {
                cube ([12, 15, 4], center=true);
              }
            }
          }
        }
      }
    }
  }
}