I used 16ga. (1/16") on mine. No pics yet. Wife has the camera, and I'm doing a trial with a chuck roll, cut in fourths. Did the mods yesterday. Staying about 15-20 difference across the smoker. Holding at 250* right next to firebox. Will post pics soon.
2 18" WSM's (L&DE), 1 22" WSM (AA), Chargriller Pro offset, WGA, SJS, SJ, Char Broil charcoal grill