Johnny,
I have not seen pics of Marty Smith on an ME350, but the one that was hanging in All Baker's shop had a number 9 on it, so I assumed it was Marty's bike. Baker seemed to be in control of the Mugen stuff in the US at that time.
I was going to make my '83 CR480 all white when I install my ME480 kit, but I think it would be better as a red bike, since there were only engine kits by that time and I have found no photos of original white ME480's.