how big of an enclosure are you building?
im not building one from scratch, however, i am getting ready to modify some 5,10 and 20 gal fish tanks
i have a few links that might help you
this one is on how ot make a fake backround
http://crestedlady.com/howto.htmand if you search the repashy forums and the geckosunlimited forum, you should find a few threads on how to do the tank, i couldnt find them on a quick search but i know they are there...one user to look for is haroldo.....