An "Unlimited" Italian light cruiser

I decided to see what could be done with a fast Italian light cruiser, using the Springsharp we have now. I increased the size and length to see how fast the ship could be. Without too much trouble, I was able to achieve 39 knots, with an armament of 9-5.3in/45 DP, 8-37mm AA guns, and 8-21in TT in two mounts. The size necessarily ballooned. I did a second version with a wide transom stern, and that made a big difference. This is the Springsharp report:

It/CL/1939 fast design study, Italy Light Cruiser laid down 1939 (Engine 1950)

Displacement:
 6,796 t light; 7,014 t standard; 7,447 t normal; 7,793 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (625.97 ft / 614.00 ft) x 56.00 ft x (20.00 / 20.56 ft)
 (190.79 m / 187.15 m) x 17.07 m  x (6.10 / 6.27 m)

Armament:
      9 - 5.30" / 135 mm 45.0 cal guns - 75.00lbs / 34.02kg shells, 150 per gun
   Dual purpose guns in turret on barbette mounts, 1939 Model
   3 x Triple mounts on centreline ends, majority forward
  1 raised mount - superfiring
      8 - 1.46" / 37.0 mm 55.0 cal guns - 1.67lbs / 0.76kg shells, 150 per gun
   Anti-air guns in deck mounts, 1939 Model
   8 x Single mounts on sides, evenly spread
  8 raised mounts
      Weight of broadside 688 lbs / 312 kg
      8 - 21.0" / 533 mm, 21.00 ft / 6.40 m torpedoes - 1.438 t each, 11.504 t total
 In 2 sets of deck mounted side rotating tubes

Armour:
   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 1.00" / 25 mm 1.00" / 25 mm  1.00" / 25 mm

   - Armoured deck - multiple decks: 0.70" / 18 mm For and Aft decks

   - Conning towers: Forward 1.00" / 25 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 122,654 shp / 91,500 Kw = 39.00 kts
 Range 4,200nm at 15.00 kts
 Bunker at max displacement = 779 tons

Complement:
 400 - 521

Cost:
 £4.154 million / $16.615 million

Distribution of weights at normal displacement:
 Armament: 181 tons, 2.4 %
    - Guns: 170 tons, 2.3 %
    - Torpedoes: 12 tons, 0.2 %
 Armour: 291 tons, 3.9 %
    - Armament: 64 tons, 0.9 %
    - Armour Deck: 219 tons, 2.9 %
    - Conning Tower: 8 tons, 0.1 %
 Machinery: 2,934 tons, 39.4 %
 Hull, fittings & equipment: 3,389 tons, 45.5 %
 Fuel, ammunition & stores: 651 tons, 8.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   5,758 lbs / 2,612 Kg = 77.4 x 5.3 " / 135 mm shells or 0.9 torpedoes
 Stability (Unstable if below 1.00): 1.21
 Metacentric height 3.0 ft / 0.9 m
 Roll period: 13.6 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.23
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has a flush deck,
   an extended bulbous bow and large transom stern
 Block coefficient (normal/deep): 0.379 / 0.386
 Length to Beam Ratio: 10.96 : 1
 'Natural speed' for length: 28.54 kts
 Power going to wave formation at top speed: 59 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 15.00 degrees
 Stern overhang: 5.00 ft / 1.52 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 25.00 %,  26.00 ft / 7.92 m,  21.00 ft / 6.40 m
    - Forward deck: 30.00 %,  21.00 ft / 6.40 m,  19.00 ft / 5.79 m
    - Aft deck: 30.00 %,  19.00 ft / 5.79 m,  18.00 ft / 5.49 m
    - Quarter deck: 15.00 %,  18.00 ft / 5.49 m,  18.00 ft / 5.49 m
    - Average freeboard:  20.00 ft / 6.10 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 135.8 %
  - Above water (accommodation/working, high = better): 194.1 %
 Waterplane Area: 21,671 Square feet or 2,013 Square metres
 Displacement factor (Displacement / loading): 110 %
 Structure weight / hull surface area: 95 lbs/sq ft or 465 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.70
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent