Most of the CGI stuff is beyond me, but it seems that it wouldn't have to be that complex. Most of my suggestions would include minor changes to existing shots, like when you see the Rebel fleet, adding a few more Mon Cal cruisers in the distant background to imply a bigger battle. The most complex shots would be new clips, like the B-wing shots I suggested, but even then I don't think it's necessary to render the entire fleet engaging in battle. I guess the true most complex shot would involve the Executor and several Mon Cal cruisers, but I truly don't believe it's necessary to do the whole battle in CGI.

But I admit, I don't know what I'm talking about, and maybe I'm wrong. Out of curiosity, would it be easier on our computer resources to use physical models and blue screens and composite them in?

EDIT: I'm not sure I understand what your post is telling me. Perhaps you are referring to actually designing the intricacies of a ship. That does certainly sound complex. This stuff is all unknown to me, but I am confident we can figure something out. I really think it'd be cool if someone actually built models and filmed them.