Hello everyone! I would like to build 500 gallon smoker (Ordered 0.26x100x42-inch tube). I want to have stable temperatures across the smoker. Not sure if I can handle same temperatures across 100-inch normal offset smoker. (But I saw video of Moberg Smokers and that was pretty accurrate!). Normal/Reverse? Would like to do one type of meat (pulled pork with ribs or alone briskets). But I have few questions regarding the build. I used calculator: Link to BBQ Pit Calculator Firebox: 35x35x35 (102%) Chimney: Round 8x42 But I have few questions: Green question mark: As per calculator, this should be 343 in^2. That is pretty clear, but.. How should I cut it? Leave some space from top (as heat shield). Or it should be in same level as top of firebox. Orange question mark: I guess this should be exactly same as firebox > cooking chamber hole (343 in^2). Right? Brown question mark: I will have cylinder shape, so there is no "tank round shape" to help the airflow. Do you you any bent plate to have "fake tank round" shape? Red question mark: Hole for chimney will be round 8-inch as rest of chimney. Right? Do you count chimney lenght from hole or from top of smoker? Thanks a lot!