I've got the big GOSM but would like to use charcoal, I'm thinking I could just buy a big metal bowl and sit it in the opening in the bottom where the burner is and dump the charcoal in there? I dont think I have vents on the bottom, just the top so I will probably have to put in a vent on each side near the bottom. I'm thinking it should be pretty easy to use it as a charcoal smoker but still have the burner in there if I want to use it also. Am I over looking something, seems like this would be to easy.