Your doing a great job. The fit of the rear qtr to door, every car must be unique...my AMD fit the door contour real well with very little fuss.
When I used the POR15 on bare metal, I rough sanded the metal with 50-80 grit, but the POr still would not stick very well. Ended up using 2-part etching primer then POR.
It's good to see all these old mopars getting rebuilt and distanced from the crusher.
Keep up the good work.
I lived in Yakima in the mid 70"s. Spent 2 years at taking the YVCC auto tech program. How's the town doing these days?