IMHO, by 1943 a more likely (and definitely more achievable) secondary armament refit would replace the 6/47 triples with 5/38 twins, and replace the eight 5/25 open mounts with six to eight (not sure amidships) single 5/38 pedestal mounts, probably
Mk 12. This would mean you wouldn't need to rip up O-2 for 5/38 handling rooms (which would instead replace the newly opened trunks of the 6/47), you could mostly re-use the 5/25 ammo handling I suspect, and you'd have the awe-inspiring total of 11-12 5/38 barrels on either beam. You'd also recover a
lot of stability margin; I'm a little bit skeptical that the current refit would work without bulging. Not nearly as awesome for surface warfare, but by 1943 I think the 5/38 would win out.
Of course, it's your design
(you have a slight copy-paste error on the top view, one of the 40mm tubs above the aftermost starboard 6/47)
Okay, here is USS New Hampshire (BB-55) re-gunned with 16"/45 Mark 6 used on both the North Carolina (BB-55) and South Dakota (BB-57) classes. I have also replaced the 6 inch three gun turrets with 5 inch/38s.