It should be noted that Kaga was originally slated to be a battleship. However, the Washington Naval caused the IJN to stop construction and convert Kaga to an Aircraft Carrier.
That and the Great Kanto Earthquake damaging Akagi's sister ship Amagi beyond repair. Kaga was the only other hull on hand that was sufficiently large to convert into a carrier, so Amagi's misfortune saved her from the scrapyard.
Kaga-san wearing Kongou's costume
+ 10 41cm cannon in 5 turrets
Tosa class battleship's main cannon configuration