I bought a homemade smoker a few years back. It is about 6' x 3' x 3'. The smoke comes from a cut out propane tank that is open and I burn a fire in it. I have a forest of black cherry and maple so I cut 3-3" x 2-3" pieces to burn and I soak them is water 12 hours before. This works okay but I can't control the heat or temp. Is there some sort of DYI or premade smoke box that will work for my smoker? Ideas please.