Ever think of a grow tent? They are being used more and more for large lizards like tegus and monitors all the time. If you don't want to give up a room you cna setup a 8x10 or 10x10 and have racks for ledges and a kiddy pool for soaking along with light and heat.
They a e insanely durable and are something you can break down and store easily if you need the room back.