I have a 120 gallon propane tank I am going to convert to a hybrid reverse flow half and grill. I have attached some pics of the sketch up design I have been putting together. I am ready to start building, but I would like some feedback with regards to the overall design and specifics on the fire box. The FB was oversized according to the calculator by 170% because I am using part of the tank as the FB and wanted the top door about 14" for convenience and also I wanted to leave room for an ash pan. So, I reduced the size of the FB using the calculator to determine the actual metrics needed for the intake, exhaust and FB2CC opening. Is this sound reasoning?
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