I just bought a 22 on Saturday for $75. I need to work the door a little and maybe add a gasket to it and it will be good to go. I always store my WSM's with the center section upside down so water says out...even under the cover.
Sounds like a good idea. A lot of crud builds up in the gap. The door doesnt appear to fit as snug as my 18 does - may need to seal it.