Bump for answers...
There are tons of vendors here that push Forgestar wheels and I'm sure someone could get us some info or even pics of the manufacturing process from their actual facility.
Current - 2013 N55 535xi Msport SAT
Retired - 2009 N54 335i Msport 6MT
Retired - 2000 M52TU 323i ASA Supercharged 5MT
More Photos of my car here