I have the Sterilite but you can use any tubs. Just make sure you build based on the tub you have and as far as when you build i recomend putting a cardbord between the tub and next shelf each step of the way so you have an easy sliding tub.
and as you see in mind i have back heat, but i also have Belly heat. and IMO belly heat is better if you have to choose one over the other.
Check out this on ideas on "how-to" http://ball-pythons.net/forums/showt...-(DUW-Big-Time) Also take a look at the DIY forum for more info/ideas.