I have a question about tuning plates. I am in the process of building my first smoker from the ground up. The dimensions are 7'x30". The firebox is 28"x30". It will have 2 square 4"x4" chimneys mounted side by side. I am undecided right now whether I want the traditional offset smoker with tuning plates or I want to go the reverse flow route. My question is this. How do I decide what width to make the tuning plates? I will post pics of the smoker this weekend when I finally get some time to work on it. Any advice is appreciated.