I start my build this weekend. Instead of moding my brinkman, i will be building a new DS. I m buying a 55 gallon new food safe drum with no liner. It is 35 inches high and 23 wide. Here are my final plans. I had help from a friend who has about 6 of these things
6 x 3/4 inch intake holes 1.5 inches above base
hot coal grate 2 inches from base
about 2 feet above grate is my first cooking grate with 10 inches from lid
4 inches above that is the option for second cooking rack 6 inches from lid
the lid will have 8 1/2 inch or 3/4 inch holes on top for venting smoke.
I was going to use ball valve but didnt want to spend 20$ for that and it was a lil to bulky for me. I will be using metal pipe plugs to cover vents.