Fire box time. The 1/4" plate had a slight bow, so I found two straight edges, and will tack, spread, compress, and clamp my way around it. I'm doing it on a lift because I'm too old to even think about moving it any more than I have to. I haven't cut the tank yet. I had to create an account at my welding shop to rent an inert gas rig, and I just haven't been back to get it.
Pat, I subscribe to a couple of pipefitters YouTube channels. You guys earn, or earned, your money.