I know i'm bumping again an old thread, but beign working on the Nagato class i now have the chance to update the tosa class drawings; that's because both Nagato and Mutsu recieved during their 1934--1936 reconstruction the very same guns and turrets that were initially planned to arm the tosa class battleships.
Turrets where modificed with the fitting of extra armour and a massive 10-meter rangefander on top of them, but the rest of their structure was the same from when they where built int he early 20's; using the guns i've just drawn for the Nagato class (and wich will be shown as soon i'll complete Mutsu as of 1937) and deleting the features fitted during the 30's i got the original Tosa guns wich i placed on my old drawing adjusting also the barbette to their correct size:
Tosa as a target ship:
Tosa as planned: