Ive thought about putting it in the middle too and making it to separate cages like you said.

Well these 2 snakes have been housed together for well over a year, in a 50gal tank haven't had any issues. the problem i have with that is that a 2'x2' cage is just to small.

I suppose I could just build 2 completely separate cages and stack them, but that brings up the issue of cost and size. With my current situation I need something I can easily move.