IF this were my baby, I would take Nolan's excellent advice and contact the kit car based magazines both here and in England regarding the project. Don't mention the problems, but somewhat make them aware of the teething process that goes on behind the scenes when a prototype is taken all the way to production. It would make a wonderful article. Just no name calling or dirt kickin'
Then . . . and I just can't believe that I'm typing this . . . I would give the manufacturer another chance.
I kinda think that the publicity is driving this into an unexpected area and they might do a good job of it finally. More importantly though, right now it's still a documented JPS Coupe. Nobody has touched it as yet, it's under whatever "factory warranty" exists (or doesn't) and it's got added value, monetarily and historically, because of what it is. One of the first!
Granted it IS more of a prototype than a production model, but there is considerable worth, value, cache' in that as well. The earliest versions of everything, from automobiles to antique stoves, are always more desirable. Your car falls into this "prototype" category.
Before I would let it become a shop class project, I would honestly try to keep it as a "factory product."
Consider this, If JPS ever builds a coupe and takes it racing and it does well in class, and more orders come in for wilder and more purpose built cars, and the street cars become ever better built, your car will have it's place in the history of it all. In a way, like those first TVRs or Lotus' or Devins or Cheetahs.
And right now it's "an all original, unmolested example," folks just LOVE looking at the details that went into building "those early cars."
Certainly, give the "factory" another chance. The chimps will always be there waitin' . . .