You mean this thread?

http://ball-pythons.net/forums/showthread.php?t=39083


PVCX (AKA sintra) is great to work with. I built a couple racks out of it, and it cuts and glues so easily. I think making cages is a little tougher than racks, but if you want to give it a go for a minimal investment, it is definitely your best bet.

-Evan