Right, I asked Richard Negus and Norman White. Both deny ever having heard anything about this project.
I think we can safely assume this had nothing to do with Norton Motors Ltd in England. Norman White writes: "Im wondering if some bright spark over at NVC, Paramount Boulevard might have had a go."
Though I may be unjust I have yet to encounter said "bright spark". Certainly the two gentlemen in charge- whom I know- were anything but technically minded- their job was to sell the beasts, not to wrench blowers on.
As I may have said elsewhere, we have drawings of my "Commando Tripple", the balancer engine Duckworth rode for "Classic Bike" last year. I have yet to find blower drawings or even fitting component drawings for same. Another indication this did not come from the factory.
Joe/Andover Norton