Agreed fully. In fact, if you don't devise some form of a frame for the top, even a rectangular glass tank of all glass can cost more than an off-the-shelf framed tank. The expense is indeed in the glass. Tools can cost a pretty penny too.caferacermike said:You will spend more money for the glass than you would for a ready to go tank if you try to build your own bow front. If you are "handy" you might be able to pull it off using acrylic.
I'm the guy that crazy.eddie mentioned, the one that built his own tank. You can do it. Really. But I would start with a rectangular tank. Then move up to bow front once your skill and confidence improve. And of course you've overcome the two largest hurdles - locating curved glass, and figuring out how thick your glass has to be for a non-rectangular tank.
If you decide to build rectangular, the thread crazy.eddie pointed you to provides most of the information you should need.