I'm fixing to start building my first reverse flow smoker. I'm building it out of a 250 gal tank and it will have a round fire box build out of another propane tank. I've don't a lot of research on looking around at plans and build. The biggest question I have is how far do I build dividing floor off the bottom of the tank to get the best results. The tank is a 30 in diameter and 90 in long. I've been thinking of putting it between 10-12 inches off the bottom but figured I'd ask a few people that have done this before, before I go cutting up and ruining perfectly good steel. Any insight from y'all that have done this before would be welcomed. Thank you.