As for all these suggested alterations, it all really comes down to how much you want to change the saga. Take the Emperor in ANH for example; what I've had in mind for this scene is moving the Vader/Emperor conversation from ESB (with appropriate changes) and placing it at the end of ANH, just before the awards ceremony. That would require an establishing shot of Vader's TIE approaching his Star Destroyer, and you've already made something along those lines. So it's things like that I'm wondering are they even worth mentioning or totally out of the question (for you). The now-on-hiatus Starkiller Ranch thread has a multitude of ideas of this nature, which I'd be happy to go into detail with you on should you wish to dicuss them.
Again, it's encouraging to see someone who has the time and devotion to put so much work into a project like this. Yours is certainly one of the most exciting on the board!
PS. You have a PM.