this is my plans for my grill with attached smoke house. All will be propane powered. The whole thing is designed around my current gas grill. The smoke chamber is 6 ft tall and 20 in x 20 in square internal dimensions. I figure with the amount of smoking I do now and will do that this is plenty of space. Any thoughts on BTU's necessary for the smoke burner. Venting is located on the sides one low left side and one high right side.