Alright-so I've got every little detail of my OBA setup figgered out, cept a tank. Don't want to drop a lot of coin on one. So what are yall usin, how much did it cost, and do you like it? If you are a good welder (not me) would it not be possible to make a rectangular tank? That would enable much more storage and I could have the ports anywhere I wanted, any number of them, any size I wanted.