Moped Army

If you really do want a solid tank, you should check out a thread that was posted way back when, something about "de-performance parts." Some real idiot started that thread, but there was some good info in there. I know solid tanks can be had NOS, but you can also just get your old tank and fill it with epoxy, or concrete, or lead. Careful melting that lead though! Fumes are nasty.

Best of luck!