Check out the DIY section of BP.net for ideas to build your rack:
http://ball-pythons.net/forums/forum...?125-DIY-Forum
Also, I agree with mattchibi that artificial light cycles are not necessary. For temp regulation, you have the options of building enclosed (3 sides) or open racks - open racks are not as insulated, so you will want to be sure your room's ambient temp stays in the high 70s to keep your tub ambient temps there as well. Enclosed racks are a little more forgiving because they contain the heat from the flexwatt better.
Added: Make sure you hook that thermostat up to the flexwatt, just like your current UTH!