So, right now you can't build historical accurate Yamato(at least in custom battles), reason - triple 460mm guns reload time is at best slightly below 50s, real one could fire 1 and half to 2 round per minute. Other guns also suffer from long reload, if you want guns that fire something like 2 rounds per minute then you have to choose a low-caliber crapgun that will do to battleships next to no damage .Back to Yamato, max range of triple 460mm is 40.(5?)Km, kinda off to historical 42.000 m.
My suggestion:
-add another faster reload mechanizm at a cost of increased ammo detonation
-add some kind of gun customization for example longer barrels or more explosive propeller in shell
P.S.
please note that i'm NOT a naval warfare expert. I've just played World of Warships and current slow pace of game is not ideal for me.