Pasted

module rounded_cube(d,r) {
    hull() for(p=[[r,r,r], [r,r,d[2]-r], [r,d[1]-r,r], [r,d[1]-r,d[2]-r],
                  [d[0]-r,r,r], [d[0]-r,r,d[2]-r], [d[0]-r,d[1]-r,r], [d[0]-r,d[1]-r,d[2]-r]])
        translate(p) sphere(r);
}
difference(){
    translate([-2.5,-2.5,-2.5])
rounded_cube([130,80,40], 5);
     rounded_cube([120,70,35], 5); 
  translate([27,12.5,20])
cube([74,50,40]);
  translate([-15,7.5,10])
cube([60,60,14]);   
     translate([2.5,2.5,-11])
cube([120,70,10]);  
       translate([5,5,-2])
cube([115,65,20]); 
    }
     translate([2.5,2.5,-100])
square([120,70]);