Remember how different Leia sounded when she was disguised as a bounty hunter in Return of the Jedi? That's how much a device can alter one's voice.
I like that you will try to make the Emperor hologram look closer to how he looked in ROTJ, but I still maintain that the best and simplest thing to do is simply to darken the hologram so that most of his face is not visable.
Think of the scene in ROTJ when Palpatine lands in the hangar bay. As he and Vader walks and talks, only his mouth, chin and the lower part of his left cheek is visible. That's how I think it should be in ESB as well.
I also think you should try and increase the distance between the Slave I and the Falcon while Boba Fett is tailing them; he is flying way too close.
I'm really exaciting about this project, ady. If it's even half as good as the ANH edit, it's gonna be great.