ORIGINAL: temagic
I'd say give me 3 Yamato-class CVs, capable of carrying 120 aircrafts in airgroups, instead of the storage place originally designed for the Shinano. 360 a/c would be really good in the year 1942/1943...
Or, convert the 3 ships to scrap metal and produce Zeros and Bettys (app. 30 000 total a/c) - Oh, and of course, train the pilots to fly those machines
Carriers are a possibility. For roughly the same tonnage 3 Unryus could be built per Yamato.
This opens up a whole new can of worms. In place of the Yamatos the IJN could have any number of different combinations of more useful warships.
