My first cut at a GB/CL/1912 for overseas duty

This is my first attempt at a British light cruiser for service for commerce protection and independent operations. I wanted a 540ft long ship with 10-6in guns, but I settled for 8-6in guns in twin mounts. That may be anachronistic, but it seemed necessary. The speed is 30 knots, which is something of a compromise. Faster is always better, but I wanted a fairly balanced design (by my standards). This is the Springsharp report:

GB/CL/1912, Great Britain Light Cruiser laid down 1912 (Engine 1917)

Displacement:
 7,882 t light; 8,171 t standard; 9,160 t normal; 9,952 t full load

Dimensions: Length overall / water x beam x draught
 542.84 ft / 540.00 ft x 56.00 ft x 18.00 ft (normal load)
 165.46 m / 164.59 m x 17.07 m  x 5.49 m

Armament:
      8 - 6.00" / 152 mm guns (4x2 guns), 108.00lbs / 48.99kg shells, 1912 Model
   Quick firing guns in deck mounts with hoists
   on side ends, evenly spread, all raised mounts - superfiring
 Weight of broadside 864 lbs / 392 kg
 Shells per gun, main battery: 220
 4 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 355.00 ft / 108.20 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 101 % of normal length

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 2.00" / 51 mm       -         -

   - Armour deck: 2.00" / 51 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 67,112 shp / 50,066 Kw = 30.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 1,781 tons

Complement:
 467 - 608

Cost:
 £0.711 million / $2.844 million

Distribution of weights at normal displacement:
 Armament: 108 tons, 1.2 %
 Armour: 1,865 tons, 20.4 %
    - Belts: 950 tons, 10.4 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 48 tons, 0.5 %
    - Armour Deck: 810 tons, 8.8 %
    - Conning Tower: 57 tons, 0.6 %
 Machinery: 2,460 tons, 26.9 %
 Hull, fittings & equipment: 3,449 tons, 37.6 %
 Fuel, ammunition & stores: 1,278 tons, 14.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   13,728 lbs / 6,227 Kg = 127.1 x 6.0 " / 152 mm shells or 1.6 torpedoes
 Stability (Unstable if below 1.00): 1.23
 Metacentric height 3.1 ft / 0.9 m
 Roll period: 13.4 seconds
 Steadiness - As gun platform (Average = 50 %): 73 %
   - Recoil effect (Restricted arc if above 1.00): 0.44
 Seaboat quality  (Average = 1.00): 1.47

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.589
 Length to Beam Ratio: 9.64 : 1
 'Natural speed' for length: 23.24 kts
 Power going to wave formation at top speed: 58 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 2.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  24.00 ft / 7.32 m
    - Forecastle (20 %): 22.00 ft / 6.71 m
    - Mid (67 %):  33.00 ft / 10.06 m (14.00 ft / 4.27 m aft of break)
    - Quarterdeck (15 %): 14.00 ft / 4.27 m
    - Stern:  14.00 ft / 4.27 m
    - Average freeboard: 22.11 ft / 6.74 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 97.1 %
  - Above water (accommodation/working, high = better): 192.8 %
 Waterplane Area: 21,891 Square feet or 2,034 Square metres
 Displacement factor (Displacement / loading): 120 %
 Structure weight / hull surface area: 91 lbs/sq ft or 446 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.93
  - Longitudinal: 2.03
  - Overall: 1.00
 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
 Good seaboat, rides out heavy weather easily