The Ger/CB/1915 design study

The Red Book has a specification that I am calling the Ger/CB/1915 design study:

CB  35,000 tons  6-18in, 16-5in QF guns
875ft x 105ft (58ft depth) 23.7ft light, 26.9ft deep
Cp=0l58  Cm=0.97  C=0.24
40,000 tons full load   35 knots

Weights

 4,800 tons  machinery
12,800 tons  hull
 1,500 tons  aux machinery
 2,670 tons  armament
10,430 tons  protection
 2,800 tons  miscellaneous

This is the Springsharp report for what I actually implemented:

Ger/CB/1915 design study, Germany Battlecruiser laid down 1915 (Engine 1950)

Displacement:
 41,081 t light; 42,950 t standard; 44,868 t normal; 46,402 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (881.70 ft / 875.00 ft) x 105.00 ft x (26.50 / 27.27 ft)
 (268.74 m / 266.70 m) x 32.00 m  x (8.08 / 8.31 m)

Armament:
      6 - 18.00" / 457 mm 45.0 cal guns - 2,950.00lbs / 1,338.10kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1915 Model
   2 x Triple mounts on centreline, forward deck forward
  1 raised mount - superfiring
      16 - 5.00" / 127 mm 45.0 cal guns - 65.00lbs / 29.48kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1915 Model
   16 x Single mounts on sides, evenly spread
  4 raised mounts
      Weight of broadside 18,740 lbs / 8,500 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 640.00 ft / 195.07 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 113 % of normal length

   - Torpedo Bulkhead:
  2.00" / 51 mm 640.00 ft / 195.07 m 26.50 ft / 8.08 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 5.00" / 127 mm  8.00" / 203 mm
 2nd: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm

   - Protected deck - multiple decks: 3.00" / 76 mm For and Aft decks
 Forecastle: 3.00" / 76 mm  Quarter deck: 3.00" / 76 mm

   - Conning towers: Forward 8.00" / 203 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 289,844 shp / 216,224 Kw = 35.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 3,452 tons

Complement:
 1,540 - 2,003

Cost:
 £6.034 million / $24.138 million

Distribution of weights at normal displacement:
 Armament: 3,001 tons, 6.7 %
 Armour: 10,252 tons, 22.8 %
    - Belts: 2,546 tons, 5.7 %
    - Torpedo bulkhead: 1,255 tons, 2.8 %
    - Armament: 2,318 tons, 5.2 %
    - Armour Deck: 3,915 tons, 8.7 %
    - Conning Tower: 218 tons, 0.5 %
 Machinery: 6,934 tons, 15.5 %
 Hull, fittings & equipment: 20,894 tons, 46.6 %
 Fuel, ammunition & stores: 3,787 tons, 8.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   67,333 lbs / 30,542 Kg = 23.1 x 18.0 " / 457 mm shells or 8.4 torpedoes
 Stability (Unstable if below 1.00): 1.13
 Metacentric height 6.8 ft / 2.1 m
 Roll period: 16.9 seconds
 Steadiness - As gun platform (Average = 50 %): 53 %
   - Recoil effect (Restricted arc if above 1.00): 0.94
 Seaboat quality  (Average = 1.00): 1.06

Hull form characteristics:
 Hull has rise forward of midbreak,
   an extended bulbous bow and a cruiser stern
 Block coefficient (normal/deep): 0.645 / 0.648
 Length to Beam Ratio: 8.33 : 1
 'Natural speed' for length: 29.58 kts
 Power going to wave formation at top speed: 57 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 10.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 30.00 %,  38.00 ft / 11.58 m,  33.00 ft / 10.06 m
    - Forward deck: 40.00 %,  33.00 ft / 10.06 m,  33.00 ft / 10.06 m
    - Aft deck: 10.00 %,  25.00 ft / 7.62 m,  25.00 ft / 7.62 m
    - Quarter deck: 20.00 %,  25.00 ft / 7.62 m,  27.00 ft / 8.23 m
    - Average freeboard:  31.40 ft / 9.57 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 105.2 %
  - Above water (accommodation/working, high = better): 272.1 %
 Waterplane Area: 70,059 Square feet or 6,509 Square metres
 Displacement factor (Displacement / loading): 110 %
 Structure weight / hull surface area: 219 lbs/sq ft or 1,067 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.52
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent