honestly i would do,2 6 compartment,those would be the ones on the top,2nd level would be 4 compartment,and bottom level would be 3 compartment,i have seen some balls around 900 grams in the 3 compartment oens at some of the shows,a bit cramped,but kinda like a see through hide,for anything bigger,go with towers as end pieces,i would also go with individual locking,get like a colored plexi glass sheet and cut out wide u shapes,to slide into the locks,so when showing the animals off,just have to pull the u out to open it