First attempt at a campaign is going well. Took over an hour to get the material for a single warship, and even then I had to also scrap the mining ship I built to speed up resource collection. And yes, that basically means I spent an hour of gameplay literally doing nothing.
Finally got that ship, a small but 29k material-cost frigate, onto the high seas, blew up a passing plane, destroyed an enemy mining rig, then shot down a pair of planes probably sent as a reprisal attack. Now to just build a resource platform on the spot where the rig was, and I can pump out more ships.
EDIT: Took down a major airship port. Parked my ship by the beach, with cover against fire from the anti-ship cannon tower they had. First building to be put in play was light missile tower. Marched on foot, shot through the front door, and quickly located and destroyed its AI mainframe, which captures the entire thing intact. Next to spawn in was the anti-ship tower. Again, forced entry to search for the AI core. Only this one was actually booby-trapped with ammo boxes that can accidentally be shot while breaching the AI core. Almost killed myself with ricocheting bullets, but I got the core and the tower intact.
Next was several civilian homes. Each had two AIs, but where swiftly captured. Last building to spawn in to play was the airship gantry. To my shock and horror, it also launched an Atlas-class flying battleship, which took off before I could think of what to do. It promptly bombed my frigate, taking out its weapons. Even if it hadn't, I wouldn't have had the firepower to bring the airship down. I immediately teleported to the anti-ship tower, which had the only thing that could turn the battle: a BIG FREAKING GUN. Specifically, a double-barreled CRAM cannon whose barrel was longer than the ship I came in on. One hit delivered enough of a shock to the Atlas that all it's balloons broke off. I had done enough damage to drop it from the sky, and while I had considered capturing it, it had a top-deck cannon that was still active and, with it's decreasing altitude, would soon fire on my prizes. One more shot finished it off.
Last step was to just take out the airship gantry AI, and the battle was won. A thousand or so materials for repairs, and I've gained several structures to either scrap or use.
From the Depths. I really haven't bothered with CRAM cannons much, but I'm gonna copy that anti-ship gun.