A very large battleship: Ger/BB/1941

I have thought for a long time about very large battleships and battlecruisers with many large guns. I suspect that I need to correct the Ger/CB/1941 design, as I probably have an error. I will just update the previous blog post with the corrected report. I still believe that 24in guns should be feasible, but this version has 12-21in guns in three quadruple turrets. The armour basis is 21 inches. The design is otherwise similar to the Ger/CB/1941, except for having a 30 knot speed and greater size. The ability to survive 161.9 torpedo hits seems bizarre and improbably. I guess that this design tests the limits of Springsharp. This is the Springsharp report:

Ger/BB/1941 Very Large, Germany Battleship laid down 1941

Displacement:
 165,830 t light; 173,745 t standard; 182,634 t normal; 189,746 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (1,391.65 ft / 1,380.00 ft) x 185.00 ft x (39.00 / 40.23 ft)
 (424.18 m / 420.62 m) x 56.39 m  x (11.89 / 12.26 m)

Armament:
      12 - 21.00" / 533 mm 50.0 cal guns - 5,000.00lbs / 2,267.96kg shells, 120 per gun
   Breech loading guns in turret on barbette mounts , 1941 Model
   3 x 4-gun mounts on centreline ends, majority forward
  1 raised mount - superfiring
      16 - 6.00" / 152 mm 55.0 cal guns - 115.00lbs / 52.16kg shells, 180 per gun
   Quick firing guns in turret on barbette mount , 1941 Model
   1 x Twin mount on sides amidships
      24 - 4.00" / 102 mm 50.0 cal guns - 32.00lbs / 14.51kg shells, 150 per gun
   Anti-air guns in deck and hoist mounts , 1941 Model
   12 x Twin mounts on sides, evenly spread
  12 raised mounts
      64 - 1.46" / 37.0 mm 60.0 cal guns - 1.70lbs / 0.77kg shells, 240 per gun
   Breech loading guns in deck mounts , 1941 Model
   32 x Twin mounts on sides, evenly spread
  24 raised mounts
 Weight of broadside 62,717 lbs / 62,717 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 19.0" / 483 mm 940.00 ft / 286.51 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 105 % of normal length

   - Torpedo Bulkhead:
  8.00" / 203 mm 940.00 ft / 286.51 m 38.00 ft / 11.58 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 21.0" / 533 mm 14.0" / 356 mm  21.0" / 533 mm
 2nd: 6.00" / 152 mm 4.00" / 102 mm  6.00" / 152 mm
 3rd: 1.00" / 25 mm       -   1.00" / 25 mm

   - Armour deck: 8.00" / 203 mm, Conning tower: 18.00" / 457 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 8 shafts, 306,080 shp / 228,336 Kw = 30.00 kts
 Range 12,000nm at 15.00 kts
 Bunker at max displacement = 16,001 tons

Complement:
 4,416 - 5,742

Cost:
 £82.442 million / $329.768 million

Distribution of weights at normal displacement:
 Armament: 12,057 tons, 6.6 %
 Armour: 66,109 tons, 36.2 %
    - Belts: 12,212 tons, 6.7 %
    - Torpedo bulkhead: 10,573 tons, 5.8 %
    - Armament: 12,103 tons, 6.6 %
    - Armour Deck: 29,972 tons, 16.4 %
    - Conning Tower: 1,248 tons, 0.7 %
 Machinery: 8,089 tons, 4.4 %
 Hull, fittings & equipment: 84,013 tons, 46.0 %
 Fuel, ammunition & stores: 16,805 tons, 9.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   455,012 lbs / 206,390 Kg = 98.3 x 21.0 " / 533 mm shells or 161.9 torpedoes
 Stability (Unstable if below 1.00): 1.34
 Metacentric height 21.2 ft / 6.5 m
 Roll period: 16.9 seconds
 Steadiness - As gun platform (Average = 50 %): 64 %
   - Recoil effect (Restricted arc if above 1.00): 0.33
 Seaboat quality  (Average = 1.00): 1.27

Hull form characteristics:
 Hull has a flush deck,
   a normal bow and small transom stern
 Block coefficient (normal/deep): 0.642 / 0.647
 Length to Beam Ratio: 7.46 : 1
 'Natural speed' for length: 42.75 kts
 Power going to wave formation at top speed: 38 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 9.00 degrees
 Stern overhang: 5.00 ft / 1.52 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  42.00 ft / 12.80 m,  35.00 ft / 10.67 m
    - Forward deck: 30.00 %,  35.00 ft / 10.67 m,  32.00 ft / 9.75 m
    - Aft deck: 35.00 %,  32.00 ft / 9.75 m,  32.00 ft / 9.75 m
    - Quarter deck: 15.00 %,  32.00 ft / 9.75 m,  35.00 ft / 10.67 m
    - Average freeboard:  33.84 ft / 10.31 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 52.9 %
  - Above water (accommodation/working, high = better): 285.6 %
 Waterplane Area: 202,515 Square feet or 18,814 Square metres
 Displacement factor (Displacement / loading): 128 %
 Structure weight / hull surface area: 341 lbs/sq ft or 1,667 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 1.13
  - Longitudinal: 0.95
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily