Am a bit late to the party, but the 764 is my favorite - it's such a unique bird, though, with only 2 real-world operators, so I understand why it may not make business-sense to a developer.

That being said, would love at least an external model.  What would be even better is if you somehow were able to at least port the PFD and EICAS from the 777 over, to do a "rough" build of the cockpit.  For that, I would gladly pay $76.40  ;D