Or why not try to make a playable Sen Toku
A real monster submarine.
Armaments was 3 aircrafts.
8x533mm forward torpedo tubes, 20x533mm Type 95 torpedoes, 1x140mm gun, 3x25mm machine guns, 1x25mm machine gun
The japs made 3 of them during the war from 1944-1945 and all survived the war.