Ahhh!! I just typed a huge response, but accidentaly hit a link and now it is gone... I hate that!!
Anyway... I make my racks out of melamine and the only power tools that you need are a drill and a powered hand saw.
Other things you'll need are screws, a T-square, and of course the bins you are making it for. Oh, and all the electric stuff too, when you get to that point, lol. Flexwatt, thermostat, cords, etc.
I base my racks on the methods used on this helpful website:
http://www.arbreptiles.com/cages/rack.shtml
All you have to do is adjust the measurements for the bins you are using. One thing that I don't think is mentioned on that site is using something to lay down on top of the bins to give a little tolerance between bin and melamine. Thickness of this tolerance would depend on the size of snake you plan to keep in there.
I wire my Flexwatt as belly heat rather than back heat shown on the website, and it works great.
I have since built three racks using this method, and it works pretty well. They aren't very pretty, but they hold snakes! 
Anyway, hope this helps.
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