box_length=230;
box_width=155;
box_height=34.25;
xboxes=5;
yboxes=2;
wall_thickness=3;
lid_thickness=2;

module pocket(x=0,y=0){
  pocket_length=((box_length-((xboxes+1)*wall_thickness))/xboxes);
  //echo("pocket_length:",pocket_length);
  pocket_width=((box_width-((yboxes+1)*wall_thickness))/yboxes);
  //echo("pocket_width:",pocket_width);
  pocket_height=(box_height-wall_thickness-lid_thickness);
  //echo("pocket_height:",pocket_height);
  translate([(wall_thickness+(x*(pocket_length+wall_thickness))),(wall_thickness+(y*(pocket_width+wall_thickness))),wall_thickness])
    cube([pocket_length,pocket_width,pocket_height]);
}

module lid(){
  translate([wall_thickness,wall_thickness,(box_height-wall_thickness)])
    cube([(box_length-wall_thickness),(box_width-(2*wall_thickness)),wall_thickness],false);
  translate([(wall_thickness/2),(wall_thickness/2),(box_height-lid_thickness-wall_thickness)])
    cube([(box_length-(wall_thickness/2)),(box_width-wall_thickness),wall_thickness],false);
}

module stacking_phase() {
  difference() {
    cube([box_length,box_width,(wall_thickness/2)],false);
    translate([(wall_thickness+1),(wall_thickness+1),0])
      cube([(box_length-(wall_thickness/2)-1),(box_width-(2*wall_thickness)-2),(wall_thickness/2)],false); 
  }
}

difference() {
  color("grey")
  cube([box_length,box_width,box_height],false);
  union(){
    color("red")
    lid();
    color("orange")
    stacking_phase();
    for(x = [0:xboxes])
      for(y = [0:yboxes])
        pocket(x,y);
  }  
}