-510mm/45 Type98 twin turret of the planned A-150 (litearly, nothing more than a Yamato turret with a twin gun instead of a triple)
-460mm/45 Type5 twin turret placeholder for th N°13 class (I should be able to scan a reliable schematic from my hachi-hachi book one of those days)
-409mm/45 Type90 twin and triple turret placeholders for the Hiraga and Fujimoto BB plans of 1930 and some of the preliminar Yamato designs
-200m/50 Type3 N°1 Mod-B twin turret from the Aircraft carriers Akagi and Kaga (*)
-152mm/40 Type 41 single open and shielded mounts from early Battleships and Armored cruisers.
-127mm/50 Type3 mod-D DP twin turrets from the Yugumo and Shimakaze class Destroyers.
-127mm/40 Type89-A1 Mod-3 twins hielded mounts form the Yamato class Battleship (added the two side views to complement the front view drawn earlier by Erusia_Force)
-610mm Type89 twin torpedo tube enclosed mount
-610mm unknown tipe quintuple torpedo tube fromt he Shimakaze class Destroyer.
(*) Fun fact:
Model B turrets were actually designed after
the models C and D, henche why they resembled more the E-models (and more so, Model C was designed after model D too despite it entered service eariler...)