for neutrals, you have to pick the reb or imp side to be on, and then normal faction overt pvp rules apply
but here's what i found out there...please notice the distance of the object and the size of the object at that range

that's right!! a Star Destroyer...if you thought the corvettes were bad with 7 guns, try 100 guns! not a typo....100 frickin guns...
well I had declared reb., and got a bit too close (1-1.5k) and then took this screenshot before hypering

there's also a reb base out there for imps to blow up, but i didn't see it before i had to jump