Hypothetical Kii class

This drawing is a gift for a Japanese person who helped translating a large portion of a Japanese book into English which describes the development of the 8-8 Plan ships like the Nagato,Tosa,Kii, Amagi and finally the no.13 classes. In the book there is an artist impression drawing and a silhouette drawing showing a 6 turreted Kii class battleship. The original of these drawings are likely done by Hector Charles Bywater a British journalist who wrote various publications about the world navies and likely dates back to the early or late 1920's. Either from the
Sea-power in the Pacific : a study of the American-Japanese naval problem - 1921
or
Navies and nations: a review of naval developments since the great war - 1927

I've created this drawing from the sources mentioned using the Modernized Nagato as a basis rather than using a Nagato and Furutaka mix as depicted.

Original sources:
i.imgur.com/d6ZhJ6U.png
i.imgur.com/VKdWo7g.jpeg

The design had the following characteristics:
Dimensions: 249 (wl) 251,8 (oa) x 32,25
Displacement: Unknown
Engines: Unknown
Speed: 48km/h (26knots)
Range: 14.800km at (8.000nm at 10knots)
Armaments:
6x2 41cm/45 3rd Year Type Cannons,
18x1 15cm/45 3rd Year Type Casemated Guns,
6x2 12,7cm/40 Type 89 DP-AA Guns,
10x2 25mm/60 Type 96 AA Guns
4x1 61cm Above water Torpedo Tubes
1x Kawanishi E7K Floatplane