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I am a newbie too but you should definitely use 1/4" steel for the firebox. I built a 33 gallon reverse flow. I almost used 1/8" but was talked out of it and used 3/16" instead. I am so glad that I did. 1/4" would be even better for me but for my small smoker, 3/16 seems fine (plus my welder maxes out at 3/16"). Good luck on the build!
Check out my build and the several threads that I have concerning my additions to my trailer build. I added a burner, a propane tank holder, tool box, warmer box, counter tops, water supply and sink all after I had finished the actual pit on the trailer. I started out like you with an old boat trailer and a 150 gallon air tank, then went from there.
As far as your warmer box is concerned above the firebox, you won't have any problem getting it up to temp, I actually had to add a plate in the top of the firebox to deflect heat and bring the temps down. I now run anywhere from 175 to 200 in the warmer box, which is still hotter than I would like, but it's better than 350...
Last year I added some signage to each side and a black piece to the front under my countertops to hide my water tanks. Worked out great, plus you get your team or business name out there while driving around. Gives it more of a completed look.
good evening, I got a large propane tank today to be my firebox. however I am concerned that the measurements may be a bit off. when I plug the numbers in to the calculator my firebox is around 85%. I was thinking of insetting the firebox into the cooking chamber 8 to 10 inches. the measurements are as follows
cooking chamber 24 inch dia. x 64 inches long
firebox 16 inch dia. x 42 inches long
also is there any difference In the feldon calculator for offset vs reverse flow?
Has anyone put anything together with this type of ratio? was it successful?
sorry for all the random ideas:)