IMO (if they aren't going to add shields) large ship heavy armor (and large ship blast doors and *maybe* airtight hanger doors) should be immune (or 99.9% reduced damage) from gatling turrets. It's really obscene how fast they slice through it because they can all focus fire on the exact same point. Rockets don't have the same problem because if they focus fire, the first rocket blows the rest up and only one does damage.
What, did they nerf heavy armor? Last I knew, heavy armor made cannon fire near useless.
Heavy armor has never made cannon fire useless, and I have no idea why people think it does. A large heavy armor block has 15,000 integrity. Gatling guns do 60 damage per shot at 600 RPM - which equals 600 dps. Thus a single gatling turret takes 25 seconds to punch through a heavy armor block.
Sounds good right? But you're never going to encounter only a single gatling turret on an actual warship. Let's say the enemy has 5 of them (which is still a pretty low amount). Now that block is shredded in 5 seconds. Or more likely, I built a smallish warship that has 12 gatling turrets it can bring to bear on the same target. That's about 2 seconds to punch through a layer of heavy armor.
You're building a small ship? small ship gatlings have 700 rpm with the same damage, so 700 dps. A wall of 25 gatling guns is cheap as hell and will punch through a large heavy armor block in
less than one second (actually I'm not 100% sure 25 gatlings will focus on a single block so maybe not).
Layer more armor? sure. But heavy armor is
heavy, and you need to cover the whole ship since you can't know what part will be shot at. Turrets and gatling guns are both *very* cheap, and reasonably light so you can stack tons of them on there.