Let me start by thanking all who gave me advice on this build. Especially Dave for the calculations and patience. This project started with a 2'x4' piece of 1/4 inch pipe cut in half that was originally used as an open rotisserie. Naturally I decided to turn it into a smoker. After a lot of questions and calculating I was finally ready to start. Talked the wife into me getting a plasma cutter for an early Christmas present. Got my materials and went to work. Stack is 6" stovepipe and I made the lid out of a 55 gallon barrel.