Hi Andrew,
With regard to your chrome strip trim on the tail lights, I have use a business called The Bronzing Studio in Castle Hill to re-chrome many plastic parts. You have gone to a lot effort to restore you lights and for the extra $160.00 it makes a big difference.
Once re-chromed, tape up what you do want to paint and spray with Holts plastic primer (2 coats is enough) from Repco. I have found Tamiya flat black model paint in the small spray can works really well to give the the original finish.
I have also found CT18 cleans the housing very well, prepsol can also be used afterwards to remove any left over marks. My housings were fairly ordinary to start with and came up like the images attached.
NOTE: Prepsol will remove the original stamped markings on the housing, try to avoid this area if originality is wanted.
Your lights should then look better than you. A polishing wheel on a bench grinder is a quick way to get perfect lenses if you are lazy like me.....
Cheers,
Aaron