I'll be very interested to see this. Question: which version of the films will you be using as a basis? It could be very cool to stick entirely to the original versions (rather than SE or Revisited) and make the thing look like it could have been made in the '70s.
Also, a film as long as this one is going to be deserves an intermission, like an olde-stylee epic. Thoughts on where this might go?