My attempt at a big, fast Italian battleship: the It/BB/1937

The It/BB/1937 is my attempt at a big, new Italian battleship with the obligatory 9-15in gun main armament. The speed is 30 knots, although the armour basis is just 13in. The secondary and AA armament is to my own specification. This is the Springsharp report:

It/BB/1937, Italy Battleship laid down 1937 (Engine 1941)

Displacement:
    40,876 t light; 42,629 t standard; 44,300 t normal; 45,637 t full load

Dimensions: Length overall / water x beam x draught
    773.47 ft / 770.00 ft x 105.00 ft x 32.00 ft (normal load)
    235.75 m / 234.70 m x 32.00 m  x 9.75 m

Armament:
      9 - 15.00" / 381 mm guns (4 mounts), 1,687.50lbs / 765.44kg shells, 1937 Model
      Breech loading guns in turrets (on barbettes)
      on centreline ends, evenly spread, 3 raised guns - superfiring
      16 - 5.30" / 135 mm guns (8x2 guns), 74.44lbs / 33.76kg shells, 1937 Model
      Dual purpose guns in turrets (on barbettes)
      on side, all amidships, 4 raised mounts - superfiring
      16 - 4.00" / 102 mm guns (8x2 guns), 32.00lbs / 14.51kg shells, 1937 Model
      Anti-aircraft guns in turrets (on barbettes)
      on side, all amidships
      36 - 1.46" / 37.0 mm guns (16 mounts), 1.55lbs / 0.70kg shells, 1937 Model
      Breech loading guns in deck mounts
      on side, evenly spread, all raised mounts
    Weight of broadside 16,946 lbs / 7,687 kg
    Shells per gun, main battery: 90

Armour:
   - Belts:        Width (max)    Length (avg)        Height (avg)
    Main:    13.0" / 330 mm    430.00 ft / 131.06 m    8.00 ft / 2.44 m
    Ends:    Unarmoured
    Upper:    10.0" / 254 mm    430.00 ft / 131.06 m    8.00 ft / 2.44 m
      Main Belt covers 86 % of normal length

   - Torpedo Bulkhead:
        4.00" / 102 mm    430.00 ft / 131.06 m    31.00 ft / 9.45 m

   - Gun armour:    Face (max)    Other gunhouse (avg)    Barbette/hoist (max)
    Main:    14.0" / 356 mm    10.0" / 254 mm        13.0" / 330 mm
    2nd:    5.00" / 127 mm    5.00" / 127 mm        5.00" / 127 mm
    3rd:    1.00" / 25 mm    1.00" / 25 mm        1.00" / 25 mm

   - Armour deck: 6.00" / 152 mm, Conning tower: 12.00" / 305 mm

Machinery:
    Oil fired boilers, steam turbines,
    Geared drive, 4 shafts, 160,456 shp / 119,700 Kw = 30.00 kts
    Range 5,400nm at 15.00 kts
    Bunker at max displacement = 3,008 tons

Complement:
    1,526 - 1,984

Cost:
    £20.747 million / $82.989 million

Distribution of weights at normal displacement:
    Armament: 2,118 tons, 4.8 %
    Armour: 17,123 tons, 38.7 %
       - Belts: 3,521 tons, 7.9 %
       - Torpedo bulkhead: 1,973 tons, 4.5 %
       - Armament: 4,746 tons, 10.7 %
       - Armour Deck: 6,559 tons, 14.8 %
       - Conning Tower: 324 tons, 0.7 %
    Machinery: 4,240 tons, 9.6 %
    Hull, fittings & equipment: 17,395 tons, 39.3 %
    Fuel, ammunition & stores: 3,424 tons, 7.7 %
    Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      67,467 lbs / 30,603 Kg = 40.0 x 15.0 " / 381 mm shells or 11.3 torpedoes
    Stability (Unstable if below 1.00): 1.03
    Metacentric height 5.8 ft / 1.8 m
    Roll period: 18.4 seconds
    Steadiness    - As gun platform (Average = 50 %): 58 %
            - Recoil effect (Restricted arc if above 1.00): 0.78
    Seaboat quality  (Average = 1.00): 1.17

Hull form characteristics:
    Hull has rise forward of midbreak
    Block coefficient: 0.599
    Length to Beam Ratio: 7.33 : 1
    'Natural speed' for length: 27.75 kts
    Power going to wave formation at top speed: 54 %
    Trim (Max stability = 0, Max steadiness = 100): 50
    Bow angle (Positive = bow angles forward): 6.00 degrees
    Stern overhang: -2.00 ft / -0.61 m
    Freeboard (% = measuring location as a percentage of overall length):
       - Stem:        33.00 ft / 10.06 m
       - Forecastle (20 %):    28.00 ft / 8.53 m
       - Mid (74 %):        28.00 ft / 8.53 m (20.00 ft / 6.10 m aft of break)
       - Quarterdeck (15 %):    20.00 ft / 6.10 m
       - Stern:        20.00 ft / 6.10 m
       - Average freeboard:    26.32 ft / 8.02 m

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 83.2 %
        - Above water (accommodation/working, high = better): 196.5 %
    Waterplane Area: 59,093 Square feet or 5,490 Square metres
    Displacement factor (Displacement / loading): 104 %
    Structure weight / hull surface area: 205 lbs/sq ft or 1,001 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0.96
        - Longitudinal: 1.46
        - Overall: 1.00
    Hull space for machinery, storage, compartmentation is excellent
    Room for accommodation and workspaces is excellent