I've been reading threads, crunching numbers, and I think I finally have it figured out. My goal is to build a durable and functional smoker entirely out of scrap, no store bought parts, no mail order etc. just whatever I can find in the scrap bins and scrap skids here at work. Often times we will scrap entire sheets due to scratches or they aren't flat within tolerance. I scored a sheet of 11ga and proceeded to roll me a 24" I.D. By 48" long cook chamber. I ran a ratchet strap around it and tacked it together. This is as far as I am right now, waiting on the laser to cut the end caps for me. Time for the numbers game. I used the formulas here on the site. CC volume: 21715 FB/CC opening: 86.86 Area under RF plate: 86.86 Area end of RF plate: 86.86 FB volume: 7165 ESV 369.155 Stack 4.00" OD x.120 wall round 33.560 long RF plate 20.785 Wide by 43.5 long .312 stainless FB/CC opening 6.00 x 20.785 I hope the numbers are right. Seems like the RF plate is quite a bit lower than where the cook grate will be as it will be 6" below it. Fire box inside dimensions above the grate will be 21" wide by 18" deep and 24" high with 3-4" below the grates. Speaking of grates I scored a bunch of this for inside the FB I also scored some expanded stainless sheets for the cook surfaces. I will use a combo of this, .312 stainless rod, and stainless angle I forgot to mention this is my first ever smoker build so any critiques will be greatly appreciated, I'm new to the smoke world but not new to fabrication. Enjoy!