Keep in mind that (some of) those pictures were taken out on the Bonneville Salt Flats, not your everyday corrosion adder...
Tim Moran posted a number of pics (of the crudeness of the roof grafting) some time back.
Personally, I love the concept, and have to agree, too bad the work wasn't done to a higher standard. I honestly wish I had the time and money to build a Healey Coupe; I'd go more for the Acme fastback hardtop look, rather than that of Donald's personal car (though I really like that one too).
If one of these ever turn up, I can only hope to snatch it up before anyone else does...