It would require a team of people to work on, each doing different things. The first group of people would work on the plot, and they would try to satisfy as many people on the forum as possible. That would be one of the main goals of this fan-movie.
I have to agree with the other Austin, though. We would have to wait a while before we could viably make this thing. We don't have the software to do it, and iMovie HD is pretty much only good for putting scenes together with transitions. That would be something I could do, if I could get my hands on iLife '08.
However, this break between thinking of it and making it gives us one good thing. We can work on the plot while we wait for technology to make this project viable. This way, we'll have a couple of years to work on the plot. Then, we will have a good, well-thought-out plot.
About making the movie, that will wait. Until then, brainstorm away!!! I'll help think of the plot.
Oh, and Malte, I only said the Three Gorges Dam because this would be like no other project here. Pretty much like the Three Gorges Dam, except less work done on the Yangtze River.