Haven't decided whether to go with a tape gasket or high-temp silicone to seal it up. I'm confident that the Permatex Red RTV is fine for the smoker box, but not sure about the fire box.
I've been using old barbecue racks wrapped with alluminum foil for a half-assed baffle and tuning plate, so I'll need to replace them with the proper materials. I still need to figure out what dimensions to make the tuning plate(s) considering the dimensions of the smoker.
Any suggestions from Highland owners would be appreciated.