Awesome. My only advice would be to replace the Mk.8 radars on the Mk.34 directors with the earlier Mk.3 FC set (any mod). These were kind of jury-rigged to earlier mounts.
I might also replace the Mk.44 directors for the light AA with Mk.49s. I generally don't think the primitive Mk.44 was mounted if anything "modern" like the Mk.49 or Mk.51 was available.
The mainmast would probably just have the SG set on a small platform with a servicing platform below it instead of the complex setup you have now. I know some of the Clevelands had a similar fit but I'm not sure why this was done (maybe lack of radar sets at forward repair facilities? It would be easy to fabricate the antenna platform using stocks of steel, but AFAIK radar sets are generally advanced components that were built in the US.)
Kingfisher floatplanes by 1943 for sure.
Otherwise looks great!
The USS Minneapolis had the SK radar and SG radars in this setup. Would the Mk 49 or Mk 51 be that common in 1943? As far as the refit is concerned, it happened in the US, as it would require a major yard to tear down the forward superstructure and replace it with something new.