I am part way through my first smoker build. I am using a 100 lb propane tank with slightly less than a third of it being my fire box. The top of the fire box ended up being about half way up the side of the smoke chamber. I cut the opening between the two at the bottom of the smoke chamber. This creates a sort of dead space at the top of the fire box, maybe 4" in height. Question is, does this create any problems? Flow issues, too much radiant heat, ash...? Will be wood or charcoal heated. Thanks.