Taken from Wikipedia:

The Number 13-class battleship was a planned class of four fast battleships to be built for the Imperial Japanese Navy (IJN) during the 1920s. The ships never received any names, being known only as Numbers 13–16. They were intended to reinforce Japan's "eight-eight fleet" of eight battleships and eight battlecruisers after the United States announced a major naval construction program in 1919. The Number 13 class was designed to be superior to all other existing battleships, planned or building. After the signing of the Washington Naval Treaty in 1922, they were cancelled in November 1923 before construction could begin.

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2 versions of the battleship in her modernized 1940s disposition in the downloadable schematic,- one firing a broadside, the other steaming in neutral. Both have vastly enlarged conning towers and bridges,- essentially scaled up from the Yamato to fit the immense pagoda masts of the Number 13 Class Battleships. The hulls have been significantly bulged over their 1920s equivalents, mirroring the modernization of Nagato and Mutsu. Their anti-aircraft battery has been significantly bolstered in recognition of the threat of air attack by the mid-40s.

Find the other ships of the Hachi-Hachi Fleet here:

Tosa: (1922 IRL), (1920s), (1940s)

Amagi: (1920s), (1940s)

Kii: (1920s), (1940s)

Number 13: (1920s)

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Stunning renders thanks to the wonderful _NamSek_! If you don't know his excellent builds, then click on the link and go subscribe to him!