First of all: I do apologize if I presumed you'd know all the technical terms that we sometimes, kind of haphazardly throw around; abbreviations etc. Secondly: thank you for considering the critique.
What you're basically trying to do is to cram a huge main battery into what is a heavy cruiser hull. In that respect the Pensacolas are just as dreadful examples to imitate. If anything (if you want to actually use Treaty-cruiser characteristics) I'd choose my rendition of the Northampton or the French Tinclads or even the Italian examples! All with appropriate adjustments, of course. I'd seriously ditch the 12.7" armament and go with any of these instead: 7", 7.9", 8", 9.2" or 10" Those would be far more appropriate and, actually most effective against the intended targets. We all have occasionally redraw our drawings; has happened to me to, so that's no biggie!
FC-system means "Fire Control-system" and denotes both the fire control, target acquisition and range finding capabilities of your main armament and secondaries, as well, if you have a tertiary ditto. - Your crew simply put, need to know what to hit, and to do that before their opponent finds their range! Right now, your ship would be left at a terrible disadvantage with regards to this. Take a look at the Northampton-class (in the guise of USS Chicago to find out! (
viewtopic.php?f=12&t=7061)
S/L is a common abbreviation for searchlights; you put them in somewhat odd, awkward positions, where they might not do much good.
As for your secondaries, they appear to be placed on very narrow, and fragile platforms, without much room for their crews to properly operate them. Better placement is to put them on a solid deck space, where there will be ample room behind and to the sides of it for their crews to sufficiently operate the guns in action.
And, yes, that rudder of yours is way, way, too large! Again, I'll direct you to the French Treaty cruisers for inspiration:
viewtopic.php?f=12&t=4110&hilit=Suffren&start=50 (Unfortunately, some of the images [I didn't post them] appears to be resized. Don't know why...anyway, take a particular look at the Dupleix, which has a similar shaft configuration to yours - three-shafts)