OK, here’s my first attempt at a suped-up naval line-up suggestion
One thing I’m not sure of: since the late-30’s light cruiser designs tended to be full-size treaty cruisers with 12-15 6" guns instead of 8-10 8" guns, perhaps a light cruiser would make more sense if we’re talking something like an Atlanta Class rather than the “classic” examples like the Cleveland Class. Anyway, my first attempt…
USA
Superbattleship: Montana or Iowa Class
Battleship: South Dakota or North Carolina Class
Supercruiser: Alaska Class
Heavy Cruiser: Baltimore Class
Light Cruiser: Cleveland Class (or Atlanta Class ?)
Supercarrier: Midway Class
Fleet Carrier: Yorktown or Essex Class
Light Carrier: Independence Class
Escort Carrier: Casablanca Class
UK
Superbattleship: Lion Class
Battleship: King George V Class
Battlecruiser: Renown Class
Heavy Cruiser: County Class
Light Cruiser: Town Class (or Dido Class ?)
Supercarrier: Audacious Class or Malta Class
Fleet Carrier: Illustrious Class or Implacable Class
Light Carrier: Colossus Class
Escort Carrier: Bogue Class
Japan
Superbattleship: Yamato Class
Battleship: Nagato or Ise or Fuso Class
Battlecruiser: B65 Class
Heavy Cruiser: Myoko Class or Post-Conversion Mogami Class
Light Cruiser: Pre-Conversion Mogami Class (or smaller class ?)
Supercarrier: Shinano Class or Taiho Class
Fleet Carrier: Zuikaku Class
Light Carrier: Zuiho Class
Escort Carrier: Chitose Class
Germany
Superbattleship: H41 Class
Battleship: Bismark Class
Battlecruiser: Scharnhorst Class
Heavy Cruiser: Hipper Class
Light Cruiser: K Class or Liepzig Class
Supercarrier: NA
Fleet Carrier: Graf Zeppelin
Light Carrier: Seydlitz Class
Italy
Superbattleship: BB1936 Class (basically a scaled-up, 16”-gun Littorio)
Battleship: Littorio Class
Battlecruiser: Project 1929 Class (6x 15” guns, 23,000 tons)
Heavy Cruiser: Zara or Bolzano Class
Light Cruiser: Condottieri Class
Supercarrier: NA
Fleet Carrier: Aquila Class
Large Escort Carrier: Sparviero Class
France
Superbattleship: Alsace Class (basically a scaled-up version of the Richelieu)
Battleship: Richelieu Class
Battlecruiser: Dunkerque Class (8x 13” guns, 26,000 tons)
Heavy Cruiser: Algerie Class
Light Cruiser: La Galissoniere Class
Supercarrier: NA
Fleet Carrier: Joffre Class
Light Carrier: Bearn Class
USSR
Superbattleship: Sovietsky Soyuz (basically a scaled-up, 16”-gun Littorio)
Battleship: NA
Battlecruiser: Kronstadt Class (6x 15” guns, 36,000 tons)
Heavy Cruiser: Kirov Class
Light Cruiser: Chapaev Class
Supercarrier: NA
Fleet Carrier: NA
Light Carrier: Project 71A Class