The 15in-gunned version of the Ger/CB/1935 design

I am going to try all the variations of my designs from early 1999. This is the 15in-gunned version of the Ger/CB/1935 family of designs. The ship has 9-15in/50 guns, with the same secondary armament and AA armament. The speed is a rather modest 28 knots. While the deck armour seems light, this IS a battlecruiser, after all. My view is that in the 1930's, the line between fast battleship and battlecruiser became blurred. For example, the American North Carolina class were very lightly protected and lightly built. This is the Springsharp report:

Ger/CB/1935  15in guns, Germany Battlecruiser laid down 1935

Displacement:
 37,388 t light; 39,725 t standard; 42,169 t normal; 44,124 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (801.41 ft / 792.00 ft) x 108.00 ft x (29.00 / 30.10 ft)
 (244.27 m / 241.40 m) x 32.92 m  x (8.84 / 9.17 m)

Armament:
      9 - 15.00" / 381 mm 50.0 cal guns - 1,790.00lbs / 811.93kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts , 1935 Model
   3 x Triple mounts on centreline ends, majority forward
  1 raised mount - superfiring
      12 - 6.00" / 152 mm 55.0 cal guns - 115.00lbs / 52.16kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts , 1935 Model
   12 x Single mounts on sides, evenly spread
      12 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 150 per gun
   Anti-air guns in deck mount , 1935 Model
   1 x Single mount on sides amidships
      32 - 1.46" / 37.0 mm 60.0 cal guns - 1.69lbs / 0.77kg shells, 150 per gun
   Anti-air guns in deck mounts , 1935 Model
   8 x Single mounts on sides, evenly spread
  7 raised mounts
 Weight of broadside 17,931 lbs / 17,931 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 13.0" / 330 mm 500.00 ft / 152.40 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 9.00" / 229 mm 500.00 ft / 152.40 m 8.00 ft / 2.44 m
   Main Belt covers 97 % of normal length

   - Torpedo Bulkhead:
  4.00" / 102 mm 500.00 ft / 152.40 m 29.00 ft / 8.84 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 13.0" / 330 mm 9.00" / 229 mm  13.0" / 330 mm
 2nd: 4.00" / 102 mm 1.00" / 25 mm  4.00" / 102 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 13.00" / 330 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 118,048 shp / 88,064 Kw = 28.00 kts
 Range 8,000nm at 15.00 kts
 Bunker at max displacement = 4,399 tons

Complement:
 1,470 - 1,912

Cost:
 £18.473 million / $73.892 million

Distribution of weights at normal displacement:
 Armament: 3,510 tons, 8.3 %
 Armour: 14,121 tons, 33.5 %
    - Belts: 3,811 tons, 9.0 %
    - Torpedo bulkhead: 2,146 tons, 5.1 %
    - Armament: 3,217 tons, 7.6 %
    - Armour Deck: 4,608 tons, 10.9 %
    - Conning Tower: 339 tons, 0.8 %
 Machinery: 3,354 tons, 8.0 %
 Hull, fittings & equipment: 17,710 tons, 42.0 %
 Fuel, ammunition & stores: 4,782 tons, 11.3 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   69,899 lbs / 31,706 Kg = 41.4 x 15.0 " / 381 mm shells or 12.3 torpedoes
 Stability (Unstable if below 1.00): 1.17
 Metacentric height 7.5 ft / 2.3 m
 Roll period: 16.6 seconds
 Steadiness - As gun platform (Average = 50 %): 70 %
   - Recoil effect (Restricted arc if above 1.00): 0.70
 Seaboat quality  (Average = 1.00): 1.39

Hull form characteristics:
 Hull has a flush deck,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.595 / 0.600
 Length to Beam Ratio: 7.33 : 1
 'Natural speed' for length: 28.14 kts
 Power going to wave formation at top speed: 48 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 11.00 degrees
 Stern overhang: 3.00 ft / 0.91 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  33.00 ft / 10.06 m,  27.00 ft / 8.23 m
    - Forward deck: 30.00 %,  27.00 ft / 8.23 m,  24.00 ft / 7.32 m
    - Aft deck: 30.00 %,  24.00 ft / 7.32 m,  25.00 ft / 7.62 m
    - Quarter deck: 20.00 %,  25.00 ft / 7.62 m,  26.00 ft / 7.92 m
    - Average freeboard:  25.98 ft / 7.92 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 82.0 %
  - Above water (accommodation/working, high = better): 201.7 %
 Waterplane Area: 62,268 Square feet or 5,785 Square metres
 Displacement factor (Displacement / loading): 110 %
 Structure weight / hull surface area: 205 lbs/sq ft or 1,002 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.37
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent
 Ship has slow, easy roll, a good, steady gun platform
 Good seaboat, rides out heavy weather easily