This mod add Battle Carrier, Flyingdeck Cruiser, Submarine Carrier.
How to use
Seaplane Launcher II and specific class hull needed to research mods' techs.
Mod's technologies are in BBCV+ technology tab, right of industry tab.
Specific Class hull technology will open hull and some modules. (ex: Battle Carrier hull technology open Battle Carrier hull and Battle Carrier bomber launcher(flight deck).)
Built your ships same as like other class ships.
Or you can convert from base class ships like Battleship->Battle Carrier. (*Take care:Submarine->Submarine Carrier can't convert.)