I just built a 36" x 12" x 12" viv out of tileboard and it came out great (structurally speaking anyway, it looks like hell because I did most of it outside on the porch after dark). If you're looking to build a viv, you might want to consider that though. A 4'x8' sheet of tileboard costs about $10, and you can frame it with 2x2s or something similar. It's really cheap, and it holds up nicely (I got the idea from a guy that houses 14 burmese pythons in them with no problem).