Titans already have a build limit, a main weapon which puts them behind all other attack ships, and are frankly pathetic outside their aura.

But if they were upgradable to super-carriers, as in got larger core and stern sections with your Carrier AP instead of creating new ship classes, that would give a useful role to a ship which is currently under-powered -- and which already has a strict build limit.

Basically with the AP you'd get new Titan sections with more H-slots, and you'd be able to put Lunar strike craft (and so on) into those slots.

I think you already give Juggernaut nice things, but Titans are a bit needy.