Project box for electronic DIY

difference(){
difference(){
union(){

difference(){

minkowski(){ sphere(5); //cylinder(r=5,h=2); cube([70,90,4],center = true);} translate([0,0,-3])cube([80,100,10],center = true);

}
difference(){
translate([0,0,1])
cube([73,93,2],center = true);
//translate([0,0,0])
cube([70,90,30],center = true);
}
}

translate([33,43,-16])
cylinder(r=5,h=18);
translate([-33,-43,-16])
cylinder(r=5,h=18);
translate([-33,43,-16])
cylinder(r=5,h=18);
translate([33,-43,-16])
cylinder(r=5,h=18);

union(){
translate([33,43,0])
cylinder(r=1.5,h=18,$fn=12);
translate([-33,-43,0])
cylinder(r=1.5,h=18,$fn=12);
translate([-33,43,0])
cylinder(r=1.5,h=18,$fn=12);
translate([33,-43,0])
cylinder(r=1.5,h=18,$fn=12);

translate([33,43,10])
sphere(r=4.5);
translate([-33,-43,10])
sphere(r=4.5);
translate([-33,43,10])
sphere(r=4.5);
translate([33,-43,10])
sphere(r=4.5);
}
}
}

union(){
difference(){

difference(){

minkowski(){ sphere(5); //cylinder(r=5,h=2); cube([70,90,30],center = true);} translate([0,0,17.5])cube([80,100,5],center = true);

}

minkowski(){ sphere(5); //cylinder(r=5,h=2); cube([65,85,25],center = true);}

}
difference(){
union(){
translate([33,43,-17])
cylinder(r=4,h=32);
translate([-33,-43,-17])
cylinder(r=4,h=32);
translate([-33,43,-17])
cylinder(r=4,h=32);
translate([33,-43,-17])
cylinder(r=4,h=32);
}
union(){
translate([33,43,0])
cylinder(r=1,h=18,$fn=12);
translate([-33,-43,0])
cylinder(r=1,h=18,$fn=12);
translate([-33,43,0])
cylinder(r=1,h=18,$fn=12);
translate([33,-43,0])
cylinder(r=1,h=18,$fn=12);
}
}
}