The Ise class were laid down during World War I and were to be improved Fuso class dreadnoughts as part of the 1912 Emergency Expansion Program.
The central turrets were placed together and the other turrets had better arcs of fire which allowed for better firing that the Fuso class.
The living quarters for the crew were very narrow and cramped.
In 1930/1931/1936 the Ise class received their now familiar pagoda type bridge structure.
During the modernization in the mid 1930s the boilers were updated to oil firing and a funnel removed. The turbines replaced and this increased speed by 2.33 knots.
The hull was also lengthened 25'.
The 14" guns could now elevate to 43°. Two of the 5.5" gun casements were removed.
All of the torpedo tubes were removed.
Conversion to Hybrid Battleship-Carrier
After the heavy losses at Midway it was decided to transform the Ise class ships into hybrid battleship-carriers. The X and Y turrets were removed. The deck was raised two levels and a platform added. This formed a hanger that held 22 seaplanes. There was an elevator in the center of the deck.
It was designed to launch all the planes within 20 minutes by the two catapults.
To recover the seaplanes they would land alongside and a crane would lift them back aboard. Other plans involved having regular carrier planes that would take off but land on an accompanying carrier or on land.
During this conversion the 5.5" casement guns were removed. Four 5" anti-aircraft twin mounts and 37 25 mm guns were added.
In October 1944 the catapults were removed to allow for better fire from the C and D turrets.
Even with all the conversion there weren't enough pilots and none of the special planes (D4Y4 Suisei "Judy") that were intended to be carried. There's no reports of any aircraft from these ships entering in combat.