Carpets can be 4'-5' range up to 8'+
The avg size cage people use is the 4'x24"x15" or 18"
AP even has a ACReptiles design. 4'x24"x15" with a shelf.


I don't have any GTPs but I have read people using 3'x24"x18" and putting the heat panel on one side. So it can go left / right gradient and not just up / down. I'm sure some one else will chime in on that one.