They were a 'dream' of one Bernard Li of Eagle One (I think) car polishes. He made four prototypes (I saw Bernard with one in California at a Vincent do 2-3 years ago) but as suspected could not secure a supply of engines from Honda. Two things since then, Honda no longer makes the RC 51 ( I know as I just bought a new 2005 one from a dealer in a far off place (Whitehore Yukon - not RC 51 country) and second - Bernard was killed a few months ago in a single vehicle accident in think in Arizona and again I think on a Harley (or perhaps off a Harley - no disrespect intended)
Robert