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Description
Between 1942 June 2nd and 7th a major naval battle happened in the middle of the pacific ocean near some uninteresting atoll called Midway between the United States Navy and the Imperial Japanese Navy. During this battle the IJN lost many excellent and skilled pilots as well as 4 fleet carriers: Akagi, Kaga, Hiryu and Soryu. The catastrophic loss in this battle meant that the Imperial Japanese Navy got short of long range striking capital ships: Aircraft Carriers compared to the United States Navy. To remedy this aircraft carrier construction and development received high priority in the Navy but also to find other means to fill up the gap the 4 fleet carrier loss created. Among the emergency plans called the conversions of the heavy cruisers and battleships/battlecruisers still available to the navy into aircraft carriers. It was estimated by the Naval General Staff and the Naval Technical Department that the heavy cruiser conversions was required 9 months for an aircraft capacity of 30 planes and 18 months for the capital ships with a capacity to carry 54 planes and the following flight deck size:
The 4-4 Myoko and Takao class cruisers would had a 200 x 23,5m flight deck,
The 3 Mogami and 2 Tone class cruisers would had a 195 x 23,5m flight deck,
The 4 Kongo and 2 Nagato class capital ships would had a 220 x 34m flight deck,
and the 2-2 Fuso and Ise class battleships would had a 210 x 34m flight deck.

The Furutaka and Kako classes were considered too small for this role and hence not included while somewhat later the cruiser conversions were discarded as they were required for fleet service by the conclusion of the Naval Ministry. The Yamato class too was not included as they were too new too important and too powerful for such a conversion though the 3rd ship Shinano was decided for conversion, the Kongo class was later deemed to be require too much reconstruction work and their speed was still important as escorts for the carriers.
The Nagato class was discarded as their 41cm cannons were still quite powerful for surface action. That left the 2 Fusos and 2 Ises for conversion of which the the Ises taken priority due to battle damage. To speed up the conversion a modified plan was created which meant only a partial flight deck was to be installed first and full conversion would be taken at a later time so Ise was modified in Kure and Hyuga in Sasebo. Fuso and Yamashiro would be modified similarly after the two ships completed their reconstruction with the expected start of the work in 1943 June, Fuso in Kure and Yamashiro in Yokosuka.
As a side note this carrier crisis in the IJN lead of the conversion of the battleship Shinano, the heavy cruiser Ibuki into aircraft carriers and the construction order of the Unryu class simplified Hiryu type carriers.

Here I show you in my opinion the possible look of the Nagato class if were to be converted into a fleet carrier. I've originally chosen a Junyo type bridge but decided to modify the Shinano's bridge to fit on this hull. As for the aircraft storage, I could put 52 aircraft in her Hanger (40 + 4 spares of each type) though it would be quite crowded, but if Shinano type deck parking was taken into account the 54 aircraft capacity could be easily reached.

The 3 variants shows the 3 possible deck materials: Wooden deck, Full metal deck, Shinano type linoleum deck.

The design had the following characteristics:
Dimensions: 201,17 (pp) x 221,07 (wl) x 224,94 (oa) x 34m (fd) 45,6m (max) x 9,50m
Displacement: Unknown
Armour: 305mm Belt, 127mm Deck and 76mm Slopes
Engines: 82.000shp, 4-shafts
Range: 15.800km at 30km/h (8.560nm at 16knots)
Speed: 50km/h (26,75knots)
Armaments:
6x2 127mm/40 Type 89 DP-AA Guns,
24x3,7x1 25mm/60 Type 96 AA Guns
Sensors:
Type 13 Air-Search Radars (2 sets)
Type 21 Air/Surface-Search Radars (2 sets)
Type 22 Surface-Search Radars (2 sets)
Single Hanger with and Aircraft capacity of 45-60 planes depending on storage (Hanger only or Hanger+Flight Deck)
22+4 Mitsubishi A6M Zero fighters
8+4 Nakajima B6N Jill Torpedo Bombers
10+4 Yokosuka D4Y Judy Dive Bombers

Description
Between 1942 June 2nd and 7th a major naval battle happened in the middle of the pacific ocean near some uninteresting atoll called Midway between the United States Navy and the Imperial Japanese Navy. During this battle the IJN lost many excellent and skilled pilots as well as 4 fleet carriers: Akagi, Kaga, Hiryu and Soryu. The catastrophic loss in this battle meant that the Imperial Japanese Navy got short of long range striking capital ships: Aircraft Carriers compared to the United States Navy. To remedy this aircraft carrier construction and development received high priority in the Navy but also to find other means to fill up the gap the 4 fleet carrier loss created. Among the emergency plans called the conversions of the heavy cruisers and battleships/battlecruisers still available to the navy into aircraft carriers. It was estimated by the Naval General Staff and the Naval Technical Department that the heavy cruiser conversions was required 9 months for an aircraft capacity of 30 planes and 18 months for the capital ships with a capacity to carry 54 planes and the following flight deck size:
The 4-4 Myoko and Takao class cruisers would had a 200 x 23,5m flight deck,
The 3 Mogami and 2 Tone class cruisers would had a 195 x 23,5m flight deck,
The 4 Kongo and 2 Nagato class capital ships would had a 220 x 34m flight deck,
and the 2-2 Fuso and Ise class battleships would had a 210 x 34m flight deck.

The Furutaka and Kako classes were considered too small for this role and hence not included while somewhat later the cruiser conversions were discarded as they were required for fleet service by the conclusion of the Naval Ministry. The Yamato class too was not included as they were too new too important and too powerful for such a conversion though the 3rd ship Shinano was decided for conversion, the Kongo class was later deemed to be require too much reconstruction work and their speed was still important as escorts for the carriers.
The Nagato class was discarded as their 41cm cannons were still quite powerful for surface action. That left the 2 Fusos and 2 Ises for conversion of which the the Ises taken priority due to battle damage. To speed up the conversion a modified plan was created which meant only a partial flight deck was to be installed first and full conversion would be taken at a later time so Ise was modified in Kure and Hyuga in Sasebo. Fuso and Yamashiro would be modified similarly after the two ships completed their reconstruction with the expected start of the work in 1943 June, Fuso in Kure and Yamashiro in Yokosuka.
As a side note this carrier crisis in the IJN lead of the conversion of the battleship Shinano, the heavy cruiser Ibuki into aircraft carriers and the construction order of the Unryu class simplified Hiryu type carriers.

Here I show you in my opinion the possible look of the Nagato class if were to be converted into a fleet carrier. I've originally chosen a Junyo type bridge but decided to modify the Shinano's bridge to fit on this hull. As for the aircraft storage, I could put 52 aircraft in her Hanger (40 + 4 spares of each type) though it would be quite crowded, but if Shinano type deck parking was taken into account the 54 aircraft capacity could be easily reached.

The 3 variants shows the 3 possible deck materials: Wooden deck, Full metal deck, Shinano type linoleum deck.

The design had the following characteristics:
Dimensions: 201,17 (pp) x 221,07 (wl) x 224,94 (oa) x 34m (fd) 45,6m (max) x 9,50m
Displacement: Unknown
Armour: 305mm Belt, 127mm Deck and 76mm Slopes
Engines: 82.000shp, 4-shafts
Range: 15.800km at 30km/h (8.560nm at 16knots)
Speed: 50km/h (26,75knots)
Armaments:
6x2 127mm/40 Type 89 DP-AA Guns,
24x3,7x1 25mm/60 Type 96 AA Guns
Sensors:
Type 13 Air-Search Radars (2 sets)
Type 21 Air/Surface-Search Radars (2 sets)
Type 22 Surface-Search Radars (2 sets)
Single Hanger with and Aircraft capacity of 45-60 planes depending on storage (Hanger only or Hanger+Flight Deck)
22+4 Mitsubishi A6M Zero fighters
8+4 Nakajima B6N Jill Torpedo Bombers
10+4 Yokosuka D4Y Judy Dive Bombers