since you are understandably tight on coin because of COVID as you mention in your intro, The thin air tank as a FB is not out of the question as long as you raise your fire above the coal bed, and off of the thin tank. A fire grate and an ash pan below it would save it for a while too, plus make it easier to clean. of course you will likely need to shorten the FB tank to the correct volume based on the pit calculator which is found on this site too. U might b able to remove one of the end bells off and shorten the tank then add the same bell back on, which'll save a little metal for an end cap. The nice thing about metal is you can always cut things off and fix it in the future if/ when you see thin spots, or wanna go another route,ChillinC wrote: ↑September 12th, 2020, 9:23 amNew to smokerbuilder and building smokers. I have an 80gal compressor tank that I would like to build a reverse flow smoker with. I have a craftsman 30gal tank I was going to use as the fire box but was told its probably to thin and will burn out a lot faster than I would like. Coming up with the extra cash for as much 1/4" steal I will need for the box and baffle is a bit of a challenge during our covid era. Hope to be able to gather more information on the build in the meantime. Thanks for having me
ChillinC