Then, I booleaned 12 smaller boxes from the main box to create the cells, and converted it again to editable poly (Fig.56).


 For the doors, I started again with a thin box primitive (Fig.57)


And deleted the back polygon and scaled down the front one (Fig.58).


I selected the vertical edges and used the "Connect” button to cut them in the upper part (Fig.59).



Then I used chamfer to split them up a bit (Fig.60).


 I selected the horizontal edges and used the connect button again to cut them (Fig.61). I switched to polygon sub object mode and used the "Hinge Polygons from Edge” command to create the little upper slot of the door (Fig.62). Then I deleted the slot's bottom polygons (Fig.67), and repeated these steps to make the other slots (Fig.63).