This is all very odd, and quite frankly I don't believe much of it. Why would Donald Healey be interested in a new small car for the American market when he introduced the Sprite in 1958? Why would he prejudice sales of his own design by assisting with another? It looks ungainly and more like a home-built special - the Sprite at least looked cute gawky. Having said that, the seats look like Sprite items, and the headlight arrangement is similar although the lenses are very close together - would they have met legal requirements?
And why call the company Westland? Is that the name of the American backer? It's all a bit too much like a previous Healey model which was twice the size. I'm starting to think the whole photo/promotion business was some sort of April Fools' joke. Hence the stetson. That body could have been any one of the numerous "specials" available in the UK at the time.
Having said all that, it appears to have finished up in the States. Maybe the joke went too far.