its a standard 30 lb propane tank off the top of my head its 12.25 in dia 21 in long but I plan on casting the ends of it flat to help reduce cubic in with how thick I want to make the ends I was coming up with around 14-16in in length. I can come up with a 20lb forge if needed I just jumped on the 30lb because it was free. Do you think the bigger tank is over kill ?