*BUMP*
I've been checking on the gasket issue and today I made some experiments with EPDM white rubber profile that I was able to source out. It seals good and looks right. I want to check out a silicone rubber cord which should be even better as EPDM extruded rubber is a somewhat porous material.
Here is the result so far:
We're getting closer to a very good finished product.
Screws are also on the way.