Ive passed this on to afew people recently and realized it might be a good idea to post it for every one.
http://www.garf.org/ is the web home of Geothermal Aquaculture Research Foundation. They have some DIY pages that are realy neat.
you click on DIY Pages and then tank building. a page comes up where you can put in the H, W, and L, you want wour tank to be and what you want to make it out of: Acrylic, Glass, Plywood w/ Acrylic, Plywood w/ Glass and just push submit. The site tels you your overall gallons and gives you: a cut list, materials list, and step by step instructions. It is realy neat