22 is pretty big for a stew pot. But I'd like some of the pro cooks here with restaurant supply connections to prove me wrong.
And more power to you for creative thinking. Plenty of material on this forum to keep you dreaming. Or guessing!
And you don't seem easily scared. This is what we mean when we talk about a steel sheet roller. You can picture how you keep rolling a sheet back and forth in it, adjusting the rollers a bit tighter each time, until you form a cylinder. Any fab house and most weld shops have something like this.:
Eastwood 24 Inch Slip Roll
www.eastwood.com