I haven't got the opt in yet because I'm making huge ships for my custom faction. Otherwise, I've made Star Destroyers, Acclamators, and TIE Fighters. Actually, the destroyers I've posted in the forums are out of date, and the new ones have a ton more attention to detail. Once I post those, I think you'll like them.

Whole factions are going to take a while. I've been working on my one faction for months, and it's not even a Star Wars faction. Of course, my one faction has entirely custom ships, but if you want Rebels and Empire, that's what it's going to take. 

That takes XML modding, and even I have to consult someone else for that step. Go searching the modding forums for info on making a custom faction use a custom ship style.

If you ask me, Star Destroyers should also be their own ship class. Carrier but enough guns to qualify as a Capital.