Thanks all. I am not planning on drawing any pre-war variants of these ships as Bezobrazov has already done them (though the loss of the Dropbox public folder seems to have killed the links to the newest versions).
What did your research show for the medium AA? 2x3"/50 mounts and 2x1.1"/75 quadruple mounts?
As near as I can tell, the 3"/50 mounts and maybe one or two 1.1" quads were fitted at Mare Island in summer/fall 1940. The 3"/50s are readily apparent in this photo, taken in the Philippines in 1941:
Discussion on the Ship Model Forum states that the 3"/50s were landed at Cavite in late 1941 and replaced with 1.1" quads - meaning the ship (as lost) would have had four 1.1" quad mounts, in the circular tubs fore and aft. Maddeningly few photos of the ship post 1941 exist (they had other things to deal with than taking nice photos).
Her measure 1 light grey didn't start at the top of the funnels?
This is the best photo I can find of the ship in February of 1942 (at Darwin, Australia):
Just based on this, it would appear to me that the light grey paint started at the 02 level forward and above the 01 level aft. The funnel caps remain Dull Black (BK). The weathering of the Cavite Blue paint is also very obvious - so who knows if the upper works are actually just faded Cavite Blue?!
We will probably never know for sure, and the discussion on ModelWarships hints at this being a decades-long area of confusion.