The following link has Vallejo equivalents for all four IJN Naval Greys:
http://www.ipmsswamp.com/files/VallejoW ... alents.pdf
Sasebo Naval Arsenal Grey ....... 816 Luftwaffe Uniform Grey
Kure Naval Arsenal Grey ........... 900 French Mirage Blue
Maizuru Naval Arsenal Grey ...... 903 Intermediate Blue
Yokosuka Naval Arsenal Grey ... 869 Basalt Grey
The chart also contains other IJN colors for aircraft, linoleum, and IJN Camouflage.
As for the guns... I was looking fro information about what the gun houses looked like, when. For instance, as I pointed out, some of them show a raised rim around the aft opening of the gun houses, while others do not (sometimes the same ship at different times).
The Rainbow 140mm Guns for the 5500 ton CLs have PE parts for the aft of the gun houses, that only say to "check references."
Only... Having a poverty of resources makes that difficult to do.
MB