Though cool and handsome and all that, you could've chosen a far, far better design, such as my Duke of Edinburgh-class!
Granted the 10 6" guns in casemates were rendered virtually useless in anything but moderate seaway, the DofE:s 9.2" guns, six of them were far superior to the normal 8" guns, which you have equipped your Pluto-class with.
Also the Scharnhorst design did not lend for a stable gun platform. Both Commander Hans Pochhammer and Adm. Graf von Spee himself testified to that fact. Though the later Warriors were the best british armored cruisers built, with an exceptionally steady roll, making them steady gun platforms, the DofE:s were noted for the same characteristics as well.
One thing I did notice, on closer examination, is the fact that you've not succeeded entirely accurately to represent the famous, and characteristic whaleback bow. Maybe you should check this detail and see what can be done?
I just like the looks of that class of ships, and I am trying not to just have a carbon copy of the British Navy. The follow-on Ajax class is slated for 9.2's (just getting started with that one, so its a ways away from being posted as yet). Also, since I didn't copy the Scharnhost exactly, made a few little changes, it seems to have helped with the springsharp assessment...
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
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Sorry but the Harpy needs a rethink, too fast for size/weight/hull coefficient (bulges may stop it rolling over but they will knock a lot off your speed). Too many people - overcrowded. Too many aircraft - not enough room (14-18 might be better). Too much weight for hull (overstress). To get the amount of horsepower for your 1919 hull to get to 33 knots on the tonnage your hull is carrying would require a much larger propulsion system than your ship has room for.
Honestly, springsharp thought it was ok, and the crew is actually less than what ss said it ought be. I believe it will stay "as is". Besides, and not trying to be snarky, there was plenty of opportunity to raise concerns about the design
here in my design thread instead of in the naval factbook. It is slightly larger than the Hermes, which carried 20 aircraft, so I don't think 24 is out of line.