This discussion is driving me crazy. The reason I joined was to have access to information to correctly restore my Willys Aero. For my Corvette the National Corvette Restorers Society has a booklet that provides guidance on finishes (flat, semi gloss, gloss, black zinc, cad, aluminum, natural, ... fastener head markings, etc) When I am going to the work of blasting the part and refinishing it, why not make it right.
To address the original versus aftermarket question, it is a simple matter to have deducts for originality and deducts for condition leading to a final score.
I am very grateful for Joe Frazers effort to give us this information. As I offered when I joined the group, if anyone wants help to pull this together I am willing to help - I just cannot wait forty years for it.