As for specifics, I'll need to re-watch the ROTJ scene, but I'm thinking that it establishes Vader as entering from a lower level than Obi-Wan and Anakin. Since they look up to see Dooku, I might need to stick with the ESB shot, but I'll look at it again to see what's possible.
The ROTJ & ROTS sets are perfect for something like this with all the similarities, I think. It gives me a lot of freedom to play around with different views and vantage points -- I just need to keep the Emperor out of it, of course. It's just begging to be done with all the parallels and similarities, and I'm surprised nobody else thought of doing it before this. Close-ups will be my friend, for sure, since I have no idea how to go about compositing elements from one clip into another. I'm sure as hell no pro at this andI'm learning on the fly.
Now, as for the cut scene, I like the idea a lot, but I don't think I have a clean source for that one. I know that part of that shot was used for the 2004 DVD release, but the full conversation is cut down to remove the line in question. That would be a natural place to show the space battle I mentioned having edited earlier, and would certainly allow the whole talk at Obi-Wan's home to flow more smoothly, I believe. It would also provide a nice bridge to the Yavin battle, I agree. If anyone has footage that's cleaned up to a usable level (I'm using the DVDs as my source material for the editing at the moment), please reply here with a suggestion so I can head in that direction. It doesn't need to be perfect, but it does need to be watchable without being TOO jarring a change in quality.
Thanks again for everyone's interest and input.