Evening Trevor
Does one-off mean it's a manufacturer's prototype that didn't go into production, or that it's an amateur's, built from scratch effort?
The latter
One source describes it as a homebuild - but no plans were ever offered that I can see.
Was it presented at any well known events?
It may have been, but I cannot see there is any photo on the net that reflect's that. Let me check further.
Not sure what's happened with David...not seen anything that would have prompted the icon change
