Chuck,
This is why I spend so much time scanning the 3B Page - looking for answers.
Each "Paint" link will give some information on trim/part color:
https://cj3b.info/Paint2.htmlStarting with the para, "Black Bolt On Parts." This covers some parts but not all. I also question whether footman loops are painted as I've seen plated ones in pictures. I'm not sure if it was consistent.
Speaking of pictures, there are many historical photos scattered all over. I particularly like the B/W photos of original jeeps as I can see what they looked like "back then" vs. what can be done in a modern rebuild.
One place to start:
http://cj3b.info/Story.htmlExamples:
http://cj3b.info/Factory/FactoryWorkers.htmlhttp://cj3b.info/Photos/Toledo/Factory/FactoryLIFE/CJ3BEmployees1954.jpgAlso color examples:
http://cj3b.info/Photos/Finds/ReaganBaker1981.jpghttp://cj3b.info/Photos/Owners/Couvillon/MrsCouvillon1965.jpgThen I took a lot of images of Lawrence Wade's 1955. My initial and main reason was it was unrestored and well maintained.
http://cj3b.info/Owners/WadeDetails.htmlYou can see many of the pieces of hardware. There has been articles describing how parts would be stacked and retrieved when needed. You can find paint runs on parts like tubs, that run sideways. To me, all this indicates painting was done before assembly. When you see the shiny heads of the bolts on the photos it indicates most (if not all) hardware was plated and not covered in paint.
You can also visit other unrestored jeeps to see what they look like:
https://cj3b.info/Siblings/Caprio3A.htmland you'll find a lot of that hardware plated vs. painted.
Possible exceptions:
I believe the tailgate hinges were installed prior to painting. Also, here's a '62 that appears the fender bolts may be painted:
There are some parts I'd like to plate in my rebuild, e.g. the windshield clamps (current available replacements have an undesirable yellow zinc), but have gone the easier route and used paint to replicate plating.