I have had a couple of foul weather nights so far. I live at 7500ft right as the mountains turn to desert and have had plenty of wet days camping. Hence the pop top! The fabrics I have picked for my first test are 8oz Outdura fabrics, rot and mildew resistant and water beads off of it. It is one of the lighter fabrics that I will offer. The 8oz is very quite in the 40+mph winds that it has seen. I have spent hundreds of nights in a Westfalia that was 20yrs old. This is the fabric of choice for a lot of Westfalia owners
I will have an option for a burlier fabric that is impervious to any water. The top inch of the covered wall could have mesh to aid with moisture and air flow,or not
I currently have some water sitting on the fabrics as my camera battery charges. I'll update with some picks.
The interior finish of the vehicle has simply been to pull the headliner tight and use factory color match edge trim, like what is around your door.