Particle board can give off toxic chemicals when heated, and doesn't handle humidity well (this doesn't matter if you plan on using lids with your tubs)

All in all something like this would be a better choice:

http://www.walmart.com/ip/Sterilite-...atinum/8282890

You can even shorten the tubes between each section to make a more traditional rack:

http://ball-pythons.net/forums/showt...r-s-Snake-Rack