That bike was put together at a time when the company was owned by an American 'entrepreneur' ... or chancer as we might have called him in the UK.
I believe both the engine and frame were designed by blokes who really knew their stuff... I also believe that most people involved with the project have disowned it since, as what they designs and what was built were two very different things.
The owner of Andover Norton has a lot of the original paperwork and is putting the history of this, and other one off / prototype Nortons together.