Modernizing Bismarck as a surface-action-group flagship

How could Bismarck be modernized today while retaining her 15-inch guns?

Keep the forward guns, remove the after turrets, and rebuild the ship around modern propulsion, sensors, missiles, helicopters, and surface-group command, though a new ship would be more practical.

The proposed reconstruction retains Bismarck's forward twin 15-inch turrets but removes the after pair to release weight and internal volume. New propulsion, a rebuilt superstructure, modern sensors, close-in weapons, box-launched anti-ship missiles, and vertical-launch cells would transform the combat system. A large after hangar and flight deck could support roughly five anti-submarine helicopters, giving the ship a useful group-command and screening role. Much of the original armor would be removed because it no longer answers the dominant missile and under-keel threats. The result is a surface-action-group flagship built around command, missiles, and aviation rather than a battleship duel. The panel ultimately judges a new hull cheaper and easier than such an extreme conversion.