quote:the 6 screws were in rough shape, with a couple of them getting close to round inside …
Your solution of using allen head cap screws is the same I have been using for my restored Group 4 lights. The stock screws were metric phillips drive, fillister head screws. I have looked everywhere, and asked my local nuts-n-bolts supplier to try - nothing. Looks like you used black oxide finished screws. I have also found stainless steel and bright zinc coated varieties.
On the housings, you are also using the same paint I have been successfully using. I do however glass bead the housings to provide a uniform, solid surface.
And for revitalizing the lenses, plastic polish kits are now easy to find - marketed as headlight lens polishing kits. I haven't used one, but they appear to be a good choice for an owner's one set of lenses. (I buy my polishing material in larger sizes).
As you found out, it is an easy job with great results.
Well done.
Larry