Hey guys, cool forum you've got here. I've got a few questions for the smoker gurus here before I start butchering good metal. I have obtained a water tank measuring 15 1/2" x 45" that I'll be using to build a reverse flow smoker. Would it be a good idea to trim the length down, or will a 45" cook chamber work fine with that small of a diameter? Is there some ratio I should stick close to here? It'll have a domed end at the reverse flow turn end, if that makes any difference. Today I picked up a piece of 1/4 plate for the firebox. I'm looking to build that square with a rounded top to fit the profile of a football shaped hole for my FB x CC transition. Good idea, or bad: Thoughts? Also, I can figure the size of the hole from Whatshisnames online pit calculator (times 1.5 of course), but I'm not sure how to transition that to the football shaped cutout. Help Plz. As for my reverse flow plate: Does it need to be thick, to act as thermal mass, or can I go with something thin, like 1/16" sheet to cut weight and cost? Is there an ideal thickness here? What about building double walled using thin stuff with an air gap? Anyone here do that before? Lastly, my chimney will most likely be relatively thick walled (1/4 +/-) round tube because that's what I've got at work. I can get 2, 2 1/2, 3, 3 1/2, or 4". What's my ideal diameter? The calculator just takes whatever I throw at it and gives me a length. Thanks in advance guys. I can't wait to upgrade from my crappy 12" char broil POS.