The J/CL/1918 design

I felt like the 5.5in gun was insufficient for a ship of this size, so the J/CL/1918 has 8-6in QF guns. The size is much larger so that the range can be greater and a torpedo bulkhead could be added. The speed is still 33 knots, which is probably sufficient for 1918. This is the Springsharp report:

J/CL/1918, Japan Light Cruiser laid down 1918 (Engine 1927)

Displacement:
 7,889 t light; 8,192 t standard; 8,900 t normal; 9,466 t full load

Dimensions: Length overall / water x beam x draught
 568.36 ft / 565.00 ft x 53.00 ft x 19.00 ft (normal load)
 173.24 m / 172.21 m x 16.15 m  x 5.79 m

Armament:
      8 - 6.00" / 152 mm guns (4x2 guns), 108.00lbs / 48.99kg shells, 1918 Model
   Quick firing guns in deck mounts with hoists
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      4 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1918 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships
      16 - 2.24" / 57.0 mm guns (8x2 guns), 5.65lbs / 2.56kg shells, 1918 Model
   Anti-aircraft guns in deck mounts 
   on side, all amidships
 Weight of broadside 1,162 lbs / 527 kg
 Shells per gun, main battery: 180
 6 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 3.00" / 76 mm 455.00 ft / 138.68 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 124 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 455.00 ft / 138.68 m 17.00 ft / 5.18 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 3.00" / 76 mm 2.00" / 51 mm  2.00" / 51 mm

   - Armour deck: 1.00" / 25 mm, Conning tower: 3.00" / 76 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 92,046 shp / 68,666 Kw = 33.00 kts
 Range 5,600nm at 15.00 kts
 Bunker at max displacement = 1,274 tons

Complement:
 457 - 595

Cost:
 £1.610 million / $6.439 million

Distribution of weights at normal displacement:
 Armament: 145 tons, 1.6 %
 Armour: 1,442 tons, 16.2 %
    - Belts: 659 tons, 7.4 %
    - Torpedo bulkhead: 286 tons, 3.2 %
    - Armament: 83 tons, 0.9 %
    - Armour Deck: 386 tons, 4.3 %
    - Conning Tower: 28 tons, 0.3 %
 Machinery: 2,905 tons, 32.6 %
 Hull, fittings & equipment: 3,397 tons, 38.2 %
 Fuel, ammunition & stores: 1,011 tons, 11.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   8,434 lbs / 3,826 Kg = 78.1 x 6.0 " / 152 mm shells or 1.3 torpedoes
 Stability (Unstable if below 1.00): 1.26
 Metacentric height 2.9 ft / 0.9 m
 Roll period: 13.0 seconds
 Steadiness - As gun platform (Average = 50 %): 59 %
   - Recoil effect (Restricted arc if above 1.00): 0.46
 Seaboat quality  (Average = 1.00): 1.17

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.547
 Length to Beam Ratio: 10.66 : 1
 'Natural speed' for length: 23.77 kts
 Power going to wave formation at top speed: 59 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  26.00 ft / 7.92 m
    - Forecastle (20 %): 23.00 ft / 7.01 m
    - Mid (67 %):  23.00 ft / 7.01 m (15.00 ft / 4.57 m aft of break)
    - Quarterdeck (15 %): 15.00 ft / 4.57 m
    - Stern:  15.00 ft / 4.57 m
    - Average freeboard: 20.60 ft / 6.28 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 191.0 %
  - Above water (accommodation/working, high = better): 155.7 %
 Waterplane Area: 20,849 Square feet or 1,937 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 92 lbs/sq ft or 450 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.68
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent