Are there skins for the early-90s Rainey, Schwantz & Doohan bikes?
yes, if you join javis discord hes got new versions of the 500s and the rider skins to match.
I have about 500 hundred rider paints on the database:
Paint and Livery database Folder (https://mega.nz/#F!mzgSWazC!2-Shz-XPh3tJS045nZPKMA)
I missed this earlier but, holy sh*t, Greg! Welcome :D