XPVC isn't that heavy at all. I've been able to easily move my new racks around while they're full of snakes. No way I could ever do that with my melamine racks without destroying them in the process.
I like XPVC so much that I'm building 4 more racks next month. It never ends!
http://ball-pythons.net/forums/showt...=1#post1588462It is around 40lbs for an entire rack assembled. I weighed it. That's probably at least 1/2 as much as a sheet of melamine. I know 1/2" MDF weighs about 80-90 lbs for a 4'x8' sheet and I imagine melamine is close. I can move this rack around with one arm but I'm a decent size guy.