I'm looking at getting two Cresteds and need to quickly build an enclosure. I can get a sheet of laminated melamine. Is there a ratio to keep for floor space to height or does it matter as long as there is room to climb? I was thinking of 20" x 20" x 24" which should be nearly 40 gallons or if there is enough wood 24" x 24" x 24" which should be nearly 60 gallons. I didn't want to go any smaller than the 20 x 20 unless I hear enough people say they really don't need the length width and to make it taller. Thanks for help