Re: I've been thinking about cheap ways to kill carriers.
Concentrate them into a swarm aimed at a lift. That is the weak spot in a carrier's steel deck. The battles in various sea theatres in WWII were often a war of attrition against aircraft carriers. Many lessons were learned.
Among the lessons learned: don't put lifts in the middle of the deck. There would be a reason why modern carriers have the lifts on the sides... Go on. Have a look at a carrier, any carrier, in any navy, built since the 1950s. See if you can spot a lift in the middle of the deck.
And, one more thing: _British_ carriers had steel decks. That was why each and every one of the British Pacific Fleet's carriers continued operations after being hit by kamikazes off Okinawa. _American_ carriers, and _Japanese_ carriers, had wooden decks. This led to unfortunate results at Midway and Okinawa. Starting with the Midway class carriers, American carriers had steel decks and deck-edge lifts. Lessons learned, the hard way.