Air leaks in door of Smoke Hollow Smoker

I don't really worry about smoke (or heat) escaping, but that is because I live in FL and the temperatures down here are usually very conducive to smoking.  Seeing how far north you are, then I could see it being an issue.

If I really wanted to seal it up, then I would just put the gasket, weather stripping, etc. on it and buy a small hasp latch to make sure the door shuts snugly.  May want to put one at the top and another at the bottom.
 

Bison, morning.....  Gasket the door with wood stove gasket rope stuff.....  attach it with high temp silicone....  add a latch or 2 or 3 so the door seals....   Put the old magnetic latch in the "save it for later" drawer in the kitchen.......    

Dave