I think the factory supplied weatherstripping leaves a bit to be desired as far as sealing without creating problems closing the doors.  The problem is when my door openings were created, the gap varies quite a bit.  Me and Malcolm tried to figure out a way to make the space consistent, but it would have been a ton of work.

So I picked up a couple sizes of very compressible weatherstripping from McMaster-Carr.

After testing a couple different sizes, I determined that the 1/2″ thick material was perfect. It made contact all around the door and didn’t create any problems closing the doors.

I attached it to the fuselage so that when opening the door, water wouldn’t run into the cabin.