I finally found somebody to build me a custom rack (woot woot!), and I've read through the stickies to figure out the building plans & supplies. I'm still unsure of what else I need, in terms of heating and temperature control. I'm planning to build a 5-shelf (or 6?) similar to this one but smaller: http://ball-pythons.net/forums/showthread.php?t=50959

The rack will house Ball Pythons of various sizes, in 15qt, 28qt & 41qt Sterilite tubs... I know I need to order Flexwatt, but how much and from where? And what about the thermostat? I always hear about the Helix-something-or-other, but wasn't sure if that's what I need. Also, will each tub require its own Acu-rite? If I'm forgetting anything else, please chime in - TIA!