This is my firebox. 30X30. Top and Bottom are 1/4" and Sides are 3/16". Custom made hinges. Chamber is a 250 Diesel Fuel Tank that my father in law had since the 1960's. Custom hinges there too. The wheels are just for maneuverability in the shop. The half moon was increased some before it was connected to the firebox. These are my custom made handles. They look neat but I had to smooth the ears up because they would lay you open if you brushed by them with a bare arm. . Had my first design flaw here. I had to mount the lower grates below the door opening. I miscalculated the door cut. With the grates that I have I will have over 4000 sq. in. of cooking area. Design flaw #2. I had to cut the hams off of the pigs to get the handles to point down because in the open position I had to stand on tip toes to reach the handles. This is my temp controller. I will be checking internal on 1 butt and can check left or right chamber temp. I plan to shut down airflow when meat internal is 190 and figure out a way to bring chamber temp to around 150. This is my air injector! 3 inch tubing.