I have been working on this smoker for about three months as time permits. This is my first build so be easy on the newbie The main cook chamber is 24" x 72", the upright is 20" x 42" and the fire box is 24" cubed. Here are a few pics of the build along the way up until now. The first is the main chamber with the tuning plates fit up. The second is the carbon to stainless welded together. The third is the box tacked up. I used 3/8ths 304 stainless plate for the bottom and back splash, the rest is 3/8ths carbon.