Wow!
I just got an alert (Thanks Mr. Marmel!) that this thread from 2014 got bumped up. I have a few updates:
Juan Manuel Fangio got lifted from the 300 SLR so he can drive a Mercedes Silver Arrow (yes, I know its a GP car, but its so cool looking:
That left room in the SLR for Moss and Jenkinson (i really need to work on Jenks beard)
And Carroll Shelby (in bib overalls and hat) finally showed up to drive his Aston Martin DBR1-300