at op,

how many cages are gonna be stacked? because if u ask me stacking 2 mel cages over 6ft is a bad idea simply because of how flimsy the stuff is and then when u throw a possibly 120(healthy weight right?) burm in that its just not a good combo without some kind of frame work being included. and also if your gonna stack em more then 2 i wouldent go much further then 32'' only because itll be an absolute pain to clean them properly or atleast for me i dont know many people with a 4ft long arm to reach the back lol

for refrence right now im in the middle of building a cage that is 72x32x24 for my male retic because of how active he is and hes alittle over 7'' and i am 99% sure this will be his final enclosure because of him being a runt