I've never seen anyone make this car--but it would be a great project. There must be some useful chassis to pull this off. The original had a V6. These--as kit cars would be awesome.
You might consider the Bordinat "Cougar II", which sat on a Cobra 289 chassis, and a sister car that looked simular. They made a model kit of this car, too.
The Mustang II Proto (circa 1964) was cool, and a nose and rear kit would work, and be a customizing project for a convertible 65 or 66.
The 1967/68 Mach One, which was a chopped and customized nose/rear/hatch is something I've always wanted to make myself.
No one has tried any of these. All I've seen are those Fiberfab nosed Mustangs.
PMN