$fn=40;

difference(){  

cube([219.5,54,40]);       
 translate([-1,2,2])
  cube([221,50,42]);
      
 translate ([15, 5, 10])
  rotate([90,0,0])
   cylinder(h=8, r=1.6);
      
 translate ([15, 5, 30])
  rotate([90,0,0])
   cylinder(h=8, r=1.6); 
      
 translate ([15, 55, 30])
  rotate([90,0,0])
   cylinder(h=8, r=1.6);   
      
 translate ([15, 55, 10])
  rotate([90,0,0])
   cylinder(h=8, r=1.6);     
      
 translate ([15, 10, -2])
  rotate([0,0,90])
   cylinder(h=9, r=1.6); 
   
 translate ([15, 44, -2])
  rotate([0,0,90])
   cylinder(h=9, r=1.6); 


 translate ([0, 4, 35])
  rotate([90,0,0])
   cube([5,6,5]);  
   
   translate ([0, 54, 35])
  rotate([90,0,0])
   cube([5,8,5]);  
      
}

translate ([4, 2, 36])
  rotate([90,0,0])
    cylinder(h=2, r=4);

translate ([4, 54, 36])
  rotate([90,0,0])
    cylinder(h=2, r=4);