I recently finished building my own reverse flow smoker. Unfortunately I just found this site or I would have posted pics along the way. I will give the story and pictures now, after the fact! I began with a 500 gal LP tank that was used on our farm for many years. It was in incredibly good shape with onlya little surface rust! Thanks Dad! I filled it with water and cut one dome off and also cut out the doors. Off to buy some steel!