Yoo, happy to hear this project’s still kicking!
Honestly wish I could offer help in some regards, I do have some experience using Blender, though mostly in animation and the like, and I’d still consider myself fairly noobish.
I think one of the biggest things is getting good 3d models, even just for space scenes. I would like models for the ships on Naboo and to do an aerial battle over Naboo. This is one of the more ambitious scenes/shots I would like to pull off. This would be when the Federation is first attacking Naboo, not the climax.