just a quick tip, use Vimeo for your clips (instead of youtube... as they wont last long on youtube)
Also, you want to check out the Dawn of the Empire Episode 3 edit by L8wrtr - i think he had some really good ideas for cuts - it may give you some ideas.
I really LOVE the idea of incorporating whatever scenes may be useful from EP1 and 2.... sounds really cool. can't wait to see how it turns out