Ok, so a friend of mine is looking at building their own enclosures similar to the below design from RBI:

http://www.reptilebasics.com/2x4-Cag...r-p-16258.html

My question is, is each 2x2 side too small for an adult BP? I did the math, the floor area is almost identical to a 41qt Iris tub, the dimensions are just different..