I understand where you are coming from. Capital ships take 2 hits to sink, so they take 2 turns to build, right? I do see the logic but I have to disagree with this idea. Aside from Major ICs (30), Battleships (20) and Carriers (16) are already the most expensive units in the game. Plus, if you add the planes for the carrier, 2 fighters (20), that brings Carriers up to 36, making them the most expensive units in the game. Yeah, I know I'm talking about 3 units, but really what good is a carrier without some planes on it?
I just think they are a big enough investment in IPCs already so you shouldn't also have to invest 2 turns to get one.
I agree with you, and yes that was what I was thinking of