After some feedback I decided to expand the weapons systems available to starships besides just one cannon type. There are a few other changes as well, including prices for ships and ship cannons.
I opted for a very Slipstream approach to starship weaponry where vehicles have turret "slots" and the heroes can add in the weapons they choose. I'll add more weapon options if I come up with them.
I really envy the Savage Worlds GMs Hangout for actually having a group of people to bounce ideas around with in real time.
New Starships Doc