What a coincidence, I just started on a Star Wars Mod. I was thinking of concentrating mostly on interspace warfare. Maybe I could join your mod or at least lend you a few models if you like. The past few days I built a Star Destroyer model, I'm going to skin it soon, and I'm currently coding it, though its getting to be very complex with multiple passenger/turret weaponry and possibly a transparent external shield shell to simulate deflector shields.
Anyway, here's a screen of the star destroyer in its current state.
This is a generic star destroyer, so its details such as weaponry and finer points are left open for subclass division, which will be special upgrades it can buy to customize it (like the ISD-I and ISD-II primary subclasses).
Tell me if your interested as I will be most definitely working on quite a few other ships, Imperial and Rebel.