So is an HMS Arethusa (1912) feasible in Springsharp?

Last night, the question I had was if an HMS Arethusa (1912) style design would work in Springsharp. I tried it this morning, and was pleased with the result. I was handicapped by only having Conway's book for specification, but I think I have a credible version that is not too far off from reality. My goals were to have the right sort of machinery weight and bunker capacity, and that worked well. This is the Springsharp report:

GB/CS/1912, Great Britain Scout Cruiser laid down 1912 (Engine 1921)

Displacement:
 4,784 t light; 4,969 t standard; 5,390 t normal; 5,727 t full load

Dimensions: Length overall / water x beam x draught
 476.31 ft / 475.00 ft x 45.00 ft x 16.00 ft (normal load)
 145.18 m / 144.78 m x 13.72 m  x 4.88 m

Armament:
      6 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1912 Model
   Quick firing guns in deck mounts with hoists
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      2 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1912 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships
      12 - 1.57" / 40.0 mm guns (6x2 guns), 2.00lbs / 0.91kg shells, 1912 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread
 Weight of broadside 736 lbs / 334 kg
 Shells per gun, main battery: 180
 8 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 3.00" / 76 mm 360.00 ft / 109.73 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 117 % of normal length

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 4.00" / 102 mm 1.00" / 25 mm  2.00" / 51 mm

   - Armour deck: 1.50" / 38 mm, Conning tower: 4.00" / 102 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 2 shafts, 49,462 shp / 36,899 Kw = 30.00 kts
 Range 4,200nm at 15.00 kts
 Bunker at max displacement = 758 tons

Complement:
 313 - 408

Cost:
 £0.483 million / $1.932 million

Distribution of weights at normal displacement:
 Armament: 92 tons, 1.7 %
 Armour: 1,028 tons, 19.1 %
    - Belts: 527 tons, 9.8 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 60 tons, 1.1 %
    - Armour Deck: 415 tons, 7.7 %
    - Conning Tower: 26 tons, 0.5 %
 Machinery: 1,703 tons, 31.6 %
 Hull, fittings & equipment: 1,961 tons, 36.4 %
 Fuel, ammunition & stores: 606 tons, 11.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   5,028 lbs / 2,281 Kg = 46.6 x 6.0 " / 152 mm shells or 0.9 torpedoes
 Stability (Unstable if below 1.00): 1.24
 Metacentric height 2.2 ft / 0.7 m
 Roll period: 12.6 seconds
 Steadiness - As gun platform (Average = 50 %): 57 %
   - Recoil effect (Restricted arc if above 1.00): 0.43
 Seaboat quality  (Average = 1.00): 1.15

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.552
 Length to Beam Ratio: 10.56 : 1
 'Natural speed' for length: 21.79 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: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  25.00 ft / 7.62 m
    - Forecastle (20 %): 22.00 ft / 6.71 m
    - Mid (36 %):  22.00 ft / 6.71 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: 17.12 ft / 5.22 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 116.1 %
  - Above water (accommodation/working, high = better): 107.7 %
 Waterplane Area: 14,940 Square feet or 1,388 Square metres
 Displacement factor (Displacement / loading): 104 %
 Structure weight / hull surface area: 75 lbs/sq ft or 368 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.61
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is adequate