I'm new to smoking and purchase my first smoker, a Brinkmann cabinet type propane and have some design questions. First off the doors leak like crazy. Is the nomex seals I see around good or do I need like a silicone P-gasket? Next the flavor chips (or chunks) only last about what seems 15 minutes (30 min water soak first). The chip tray sits right on top of the burner, it seems to be incinerating the chips. I want to smoke during winter (around 30°F), are these thin walls on this smoker going to be an issue? Should I add a second wall inside to create an air insulator?