I once worked shortly for a company doing prototypes of a guitar marketed by a pickup company that had a 'twisted' neck/fingerboard.
This was conventional spaced/length frets, normal fingerboard radius, etc. It was as if you put the body in a vise, grabbed the head with vise-grips, and twisted it, taking the fingerboard with it.
This was a neckthru piece, so it was a challenge to get everything right, then be able to repeat it reliably in a production run.
The guitar in question is for sale now, with a conventional (Non-twisted) neck.
In retrospect, this is on of those ideas that seems correct . . . your hand does rotate its grip somewhat as you reach out . . . but duplicating this in wood is hard. I could see molding it in carbon fibre, but can't see making ANY money doing it. And of course, there's a practical limit as to how far you can rotate the nut in relation to the end of the neck before the strings dampen out just from the twist. And as always, most guitar players do NOT want the wheel reinvented.
Now, let me show you my flying car with the 100 mpg carburetor . . .
