The Gunboat opensup a lot of ordinance options for the Imperial fleet, but I think that cannons are going to see an awful lot more play. Here's the worst combo I could think of:
Captain Jonus (22)
Adaptability
Nu Squadron Pilots x 3 (26)
HLC
XG-1 Assaut Configuration
You get three "deadeye'd" 4-die shots, with Jonus rerolls and focus. Every ship (but particularly the gunboats) is outside what I consider the alpha-strike range - 7 hull behind 2 agility and focus can't be killed by two missile shots, so the chances are high that all your ships will get off numerous shots.
Something really nice about Slam on the gunboats in tournaments is that they're great at preserving MoV, since they can just run away when they're at 1/2 hull.
I get the feeling that three of the PS4s with linked batteries and crack shot will be better overall, but you lose a whole ship out of the build.