I am building it out of 1/4 laminant pressboard with tileboard on top of that, with carpet on top of that for the bottom. The sides and top will be the laminant pressboard witht the laminant side on the inside of the cage then seal everything to waterproof and such. I will also incorporate a piece of plexiglass on one side of the bottom so I can use an UTH. I done this for the Burmese cage and it wasnt all that hard to do. I then frame a door with a plexiglass front. I will post a picture later this afternoon of the double stacked monsters I built last weekend. This one was done with about the materials except it was framed with 2x4s to supports the weight of the snake it will be housing. It is quite heavy! I am thinking no more that 4ft in length, probably leaning towards 3ft-3 1/2though since a large enclosure can stress them out, and there is really no need to have a large enclosure for these guys. So, 3x2x12' sound good?