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150 gallon smoker build
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Here's a link to the calculator if you haven't yet run your numbers for the opening sizes: http://www.smokingmeatforums.com/t/172425/standard-reverse-flow-smoker-calculator-by-daveomak-and-others-ready-to-use-rev-4#post_1264161
Reverse flow will give you better temperature control and more even heating but it does require more steel.
1/4" is a good standard, it's a rough life inside a firebox and it can rust out if you don't take good care of it. Depends on what you have access to and if you can get more. If you can only get 1/8 and don't mind replacing it every so often, it's not a problem, its just that it will tend to warp with the heat when you get it rolling.