very interesting and beautiful ships! Love it! I wonder because Siegfried Breyer didn't mention these many variants in his books. He only mentioned the ships with the twin turrets. Maybe he didn't know about the other variants. Much later I bought a book from Futabasha press (vol. 52, published 2011) and this book shows some of the variants you depicted here, but only with 16.1" guns, no 18" guns and no ships with triple turrets, only those with twin and quadruple turrets. Maybe you have yet another source. You depicted the ships absolutely exactly here, I would say even more detailed and realistic as in the Futabasha book because the used 3D software back then was by far not so advanced than nowadays. Also your net antennas behind the conningtower is an artwork itself. Never seen before. Excellent paintings!
Most of the 18'' gunned designs are in Kojinsha "Battleships and Battlecruisers of the Hachi-Hachi fleet"
https://www.hlj.com/battleships-and-bat ... t-kjs81504
As for the designs that included triple turrets, I can offer this, although I cannot remember anymore from which book they came: