I just finished building this enclosure. It measures 4'x2'x15." Built out of melamine. I used vinyl adhesive laminate on the inside for aesthetics. I have a flexwatt pad (11") and an additional small ZooMed UTH (6") lying around that I stuck under for heat. The light inside is simply for viewing. I am currently waiting for the sliding glass doors to finish being cut and polished. This project could be completed in 1-2 days if all the materials are available. I had to wait for items such as glass door track, glass doors, flexwatt, and a thermostat.
http://i10.photobucket.com/albums/a1.../snaketank.jpg