Kind of unrelated, but I had a closet setup for my bearded dragons a few years ago and it worked great. I took the doors off the closet, and had 2 40gallon tanks and 1 20gallon in there. It was when I had a bunch of roommates and a very small apartment bedroom, so I had to make it work. Basking temps for dragons have to be around 100 degrees and I maintained the temps just fine (with basking bulbs) but I know it's different for BPs. Just saying it can probably be done!