b = 90;
  h = 153;
  d = 86;
  w = 5;
  

  
  
difference () {
  difference () {
    translate ([0,0,h/2]) cube ([b,d,h], center = true);
    translate ([0,-d/2,h]) rotate ([30,0,0]) cube ([b+1,d,h/2], center = true);
    translate ([0,d/2,h]) rotate ([-30,0,0]) cube ([b+1,d,h/2], center = true);
    translate ([-b/2+w/2,0,15]) rotate ([0,0,0]) cube ([10,d+5,h-15], center = true);          
    translate ([-b/2,0,95]) rotate ([0,45,0]) cube ([10,d+5,10], center = true);
            
  }
  difference () {
    translate ([-5,0,h/2]) cube ([b+2,d-w,h-w], center = true);
    translate ([0,-d/2,h-w/2]) rotate ([30,0,0]) cube ([b+1,d,h/2], center = true);
    translate ([0,d/2,h-w/2]) rotate ([-30,0,0]) cube ([b+1,d,h/2], center = true);
  }
    
  // uitsparing voor snoer 
    translate([0,-d/2+1, 15])
     rotate([90,0,0])
      cube([30,12,10], center=true);
    
  // Ronde uitsparing zijkanten   
    translate([-40,0,76])
     rotate([90,0,0])
      cylinder(h=90, r=22, center=true, $fn=100);

 // schroefgaten achterin
    translate([-b/2 + 20, b/2-60, h/2 - 1]) // rechter gat
     rotate([0,90,0])
      cylinder(h=b+50, d=5);
    
    translate([-b/2 + 20, b/2-20, h/2 - 1]) // linker gat
     rotate([0,90,0])
      cylinder(h=b+50, d=5);   
  
  //Watergaatjes onderin    
  
  for (x = [-30:10:60])
    for (y =[-35:10:60])
      translate([x, y, -1])
       cylinder(h = 10, d = 2,$fn = 40
        ); 
  
  }
   // drempeltje
    translate ([-b/2+9.5,0,3])
     rotate ([0,0,0]) cube ([4,d-2,3], center = true);