I am about to build a set of four stackable wooden display cages for my corn snakes...in fact, I already have all the materials just haven't had the time to get started yet.

I am using 3/4" plywood (for roof and walls, good quality) treated with one coat of PolyShades(poly and stain in one) and at least two coats of water based Polyurethane, plexiglass doors, and vinyl flooring for the inside to go over the UTH.
Each cage is going to be 30x16x12, but the dimensions could be easily adjusted for BPs.