As much as I respect the originals, I really don't think it'd be a good idea to use Shaw.
People always argue that Shaw IS Anakin Skywalker, but... frankly, the Prequels WERE made, and Hayden WAS cast as Anakin. Hayden is Anakin Skywalker, and for the sake of the Saga, it should be Anakin Skywalker who appears at the end.
Shaw played an important part as the man behind the mask - but his voice and appearance really shouldn't be the basis for the formation of the Anakin character - considering we only can go on what we have in the movies, which is only about a minute or so of an old, broken man's labored last words.
I really don't see it as disrespect to "rob" Shaw of the last few seconds he appears as a ghost. And for the sake of the full-circle of the Saga, it probably should be Hayden.
BUT! It should NOT be the Hayden we see in the DVD and Blu-Ray. They should have made him look as old as he's supposed to be (What would it be? Like 50?).
So I'd suggest maybe taking Hayden's head from another of his movies where his hairstyle isn't so rouge-like, and maybe grey him up a little bit digitally. If you really want to go the extra mile, add in some wrinkles and you're set.
And concerning a scene about the stolen plans...
I really like the idea of showing it, but I'm just a little afraid of how it affects the style in relation to other Star Wars movies. This is the kind of scene you'd see in a cold opening, which is a lot more "modern" than the overall retro style of the Star Wars movies.
Is there a way to incorporate this idea more into the flow of the script?
I like your Mock-up but I think either have the Original Ghost or no Ghost.
Your right Alanfae that's what I am scared of too because I don't want to ruin it and spoil things, like you say more modern may not fit. But the plan is make it ambigous.
My Idea Was that structurly it would go>>>>
New Opening, Plans Stolen we do not see DSII only Endor
Dagobah Yoda Dies luke leaves after he and Obi-wan talk
Vader goes DSII
The Exchange (Plans delivered)
Luke Arrives Tattoine (Beggars Canyon?)
Vader Contacts Luke Meditation chamber (deleted Scene)
Tattoine sequence with Droids / Jabbas Palce /Sail Barge
Luke Falcon Part Ways
Emporer arrives at DSII
Millennium falcon meets the fleet.
And then it's all back on track more or less.
I also thought about adding modified flash backs showing Luke's mind which is what would trigger Vader to contact him. So that he would Imagine Vader Pursuing Him Down the Death star trench whist flying through Beggars Canyon >> Obviously Vader contacts him after this.
When Luke looks at his Hand in the X-wing after Tattooine I also thought about seeing it being chopped off again with the Audio of Lukes "Nooooo!" with echo effect and Vader reaching out to him " I'll Never Join you!" Echoing over the image of Vader reaching out to him. we then cut back to the x-wing and see Luke and the new Line "I need to be alone for a while...."
That is my complete take for the first half... I doubt the Flashbacks would work as star wars does not do flashbacks really. But as it is the concluding part It would help bring some of these momments back to show their history haunting him. Ben has also told Luke by this point that Darth Vader is his father so lukes mind is plagued by the past or atleast that was my thinking.
If these flash back scenes would work would it be worth showing Vader Being constructed from ROTS after he speaks to Luke on Endor... there is a shot of Vader gazing out the window would that work at this point? It's probably the best scene in ROTS too....Just a thought anyway.