It's certainly shaping up to be a work in progress

Just something that crossed my mind: I think the problem with 4E vehicular combat rules vs. SWSE ship-to-ship combat rules is that 4E vehicles don't tend to be as complicated as SWSE ships. That said, I see no reason for a particular vehicle to be very, VERY large, with at least one PC manning the guns/crossbows/spears (that do an insane amount of damage relatively speaking), another piloting/steering, and a couple of others doing other stuff like trying to keep the whole thing intact or something.
Hmm, maybe I should try doing a SWSE - 4E translation, then eventually using the translated rules for normal 4E combat