What a modern capital surface combatant needs

If a major navy revived the battleship idea, what would the most cost-effective modern design look like?

It would be a large cruiser with deep magazines, protected vital spaces, layered defenses, and extensive aviation and missile capacity.

The proposed large combatant is designed for a long war rather than a short missile exchange. Extensive VLS capacity and at-sea reloading would give it magazine endurance, while aviation, lasers, and railguns would extend its offensive and defensive reach. Armour would concentrate inside the hull around engineering, command spaces, and structural breaks so that damage to one section did not disable the whole ship. Until railgun and laser technology matures, a Dreadnought-derived SSGN is presented as the more practical heavy missile platform.