This is my third major BBQ project that I have finished. I have a new air flow design where the fire is under the cook box as the other two BBQs I have fabricated. Between the fire box and the cook chamber is a heat deflector and a 4 gallon water pan that is 4 inches deep. The heat comes up the back false wall and then exhaust is on the sides starting about 5 inches above the water pan on both sides of the cook chamber. The outside of the BBQ is insulated with two inches of insulation and covered with powder coated sheet metal on the outside. I have stainless steel push to close latches, so opening the doors is very easy with no flimsy latches to fuss with.
Metal fabrication was 12 gage for the water pan, 14 gage for the main part of the cook chamber, and 18 gage for the doors and sheet metal. I used the 250 EXT to tack up the project and then most welding was with my Miller 252.