I used birch and oak on my enclosure -- and then sealed it with marine grade wood sealant. I've had it for almost a year, and I haven't had any problems with warping or anything. Also, I used plexiglass for the floor, which made it super easy to use heat tape.
Here's a link to pics of my cage if you need any ideas http://www.ball-pythons.net/forums/s...ad.php?t=92263
Good luck!
George
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