Okay, the plans are final. Project "Building a 90 gal. Tank" will commense in exactly one week. Here are the final dimensions. Bottom= 48" x 18" Front/Back= 48 3/4" x 24 1/2" Ends=24 1/2" x 18". The bottom is half an in. thick and the rest is 3/8th of an in. thick. The sides will wrap around the bottom, if you will, and I'm planning to use General Electric Silicone I. Does that sound good RT? I'll try my best to keep everyone posted so we can all build our own tanks and keep Petsmart from trying to rip us off!!*ALL*