You couldn't do any better for skin / panel replacement than Oasis RV in Tucson. They have been around a long time, have a long list of satified customers and only handle Airstreams. Vintage or new, doesn't matter to them. Joe Pershing runs a fine place.
As for the Nuvite, try Vintage Trailer Supply. They'll treat you right and get your order right out to you.
What are you plans for the rear window? How much needs replacing?
Keep us posted on your progress and we want to see some pictures.
4CU 2699 / AIR 10 / TAC AZ-1
I'm haunted by aluminum.
Charter Member of the 4 Corners Unit.