Ok, I've reviewed the file. First off I must say you did an excellent job of picking scenes and accompanying music for the flashbacks, and even tried to work in an explanation for Obi-Wan's ghostly voice. However, seeing this test reinforces my idea that is is not the way to go. Maybe if we had Alec and Mark to refilm things for us here and there, but (to me at least) it's not looking like it's going to work. It's an interesting experiment, but think about that in the context of the film; flashbacks are NOT Star Wars style. And then there's the rest of the saga to consider; Luke's further discussions about Vader with Obi-Wan and Yoda, Luke first confronting Vader. I just don't see this scenario working. If only Lucas would release the deleted/extended scenes of the OT; the conversation between Luke and Obi-Wan in RotJ has much more to it. A key line there would be, "I was going to tell you when you completed your training," along with several others that might make Obi-Wan's "explanation" a lot more plausable.

EDIT: Here's the version of the duel I was talking about. I DID NOT DO THIS; This is from Darth Qui-Gon at TF.N. The picture quality is poor (from a SE VHS), and events shortened a little too much for my liking, but the music choices and transitions are excellent: http://rapidshare.de/files/6796739/Anakin_vs._Obi-Wan_ANH_edit.mpg.html