I'd make it out of wood, which insulates infinitely better, and will last forever if taken good care of. The attachment shows one which I will be making in the near future. You can substitute teak for interior grade plywood, and lots of U.S. hardware chains such as Home Depot will cut the wood for you.
If you have minimal woodworking skills, family members or friends can help you make the terrarium. I will install linoleum on the floor piece BEFORE it is assembled, and will use a radiant hear panel (from Boaphile), a quality thermostat, a fluorescent light (for me, not the snake), a super nice manzanita perch, a realistic background, etc.
http://www.manzanita.com/perches10.htm
It will probably be cheaper than a glass terrarium, and will look so much nicer. I will have the sliding glass door frame made for me. The design is not too common, but I've used it in the past. The terrarium is escape proof, and allows very little heat to escape.
Use Repti-Shield or West System Clear Epoxy to coat the wood...
You are welcome to e-mail me, and I can give you more detailed information...
Best wishes!
Dan
