Jesus man, you keep coming through with the connections. It's incredible that got in contact with Williams' son, and that he wants to see it. Is he able to offer any help at all, as far as the workprint? And talk to Naisbitt. What do you have to lose? After you're done, it'd be interesting to take all these interviews and such, and try to write a complete story about what happened.

And just a thought, several people have offered the opinion that there should be two restorations--one with all the good animation that is available (and the more recent version of the ending), and one only using Williams animation (without the ending that was made later). It sounds like there are a lot of guys in the know that would like to this restoration, and it would probably piss them off that after all this, they still can't get a Williams-only version of the film.