I am new to this forum. I have just came across an old air tank that I want to build into a RF smoker. The tank is 70in long with about a 22in diameter. I do not need one that long and I thought I would cut some off the end to use as the firebox? Don't know if this is doable or a good idea? I know it will require some extra fabrication but maybe better than having a firebox built. Any advice would be appreciated. I have a fried who will be doing all of the welding for me. I am supplying the materials and information to make the build.