My very large battleship design: Ger/BB/1916

This is another Ger/BB/1916 design, but this ship is very large. The length is relatively short at 900ft, but the displacement is substantial, intended to be 80,000 tons standard , as is the beam at 150ft. The armament is as large as I have used, being 10-21in BLR and 24-5in QF guns. The speed was low, intended to be 20 knots, but the power I specified, 85,000 SHP could produce 22.5 knots for a ship of this length and displacement. This is the Springsharp report:

Ger/BB/1916 Red Book, Germany Battleship laid down 1916 (Engine 1927)

Displacement:
 82,140 t light; 86,128 t standard; 92,500 t normal; 97,597 t full load

Dimensions: Length overall / water x beam x draught
 905.80 ft / 900.00 ft x 150.00 ft x 35.70 ft (normal load)
 276.09 m / 274.32 m x 45.72 m  x 10.88 m

Armament:
      10 - 21.00" / 533 mm guns (4 mounts), 4,630.50lbs / 2,100.36kg shells, 1916 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      24 - 5.00" / 127 mm guns (12x2 guns), 62.50lbs / 28.35kg shells, 1916 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships, 4 raised mounts - superfiring
 Weight of broadside 47,805 lbs / 21,684 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 18.0" / 457 mm 620.00 ft / 188.98 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 16.0" / 406 mm 620.00 ft / 188.98 m 8.00 ft / 2.44 m
   Main Belt covers 106 % of normal length

   - Torpedo Bulkhead:
  7.00" / 178 mm 620.00 ft / 188.98 m 29.00 ft / 8.84 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 12.0" / 305 mm 8.00" / 203 mm  16.0" / 406 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armour deck: 8.00" / 203 mm, Conning tower: 16.00" / 406 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 85,287 shp / 63,624 Kw = 22.50 kts
 Range 12,000nm at 15.00 kts
 Bunker at max displacement = 11,469 tons

Complement:
 2,651 - 3,447

Cost:
 £13.535 million / $54.140 million

Distribution of weights at normal displacement:
 Armament: 5,976 tons, 6.5 %
 Armour: 37,074 tons, 40.1 %
    - Belts: 7,856 tons, 8.5 %
    - Torpedo bulkhead: 4,657 tons, 5.0 %
    - Armament: 8,243 tons, 8.9 %
    - Armour Deck: 15,612 tons, 16.9 %
    - Conning Tower: 705 tons, 0.8 %
 Machinery: 2,692 tons, 2.9 %
 Hull, fittings & equipment: 36,399 tons, 39.3 %
 Fuel, ammunition & stores: 10,360 tons, 11.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   158,522 lbs / 71,904 Kg = 34.2 x 21.0 " / 533 mm shells or 38.7 torpedoes
 Stability (Unstable if below 1.00): 1.18
 Metacentric height 12.4 ft / 3.8 m
 Roll period: 17.9 seconds
 Steadiness - As gun platform (Average = 50 %): 68 %
   - Recoil effect (Restricted arc if above 1.00): 0.54
 Seaboat quality  (Average = 1.00): 1.35

Hull form characteristics:
 Hull has low forecastle
 Block coefficient: 0.672
 Length to Beam Ratio: 6.00 : 1
 'Natural speed' for length: 30.00 kts
 Power going to wave formation at top speed: 38 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: 3.00 ft / 0.91 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  32.00 ft / 9.75 m
    - Forecastle (20 %): 25.00 ft / 7.62 m (27.00 ft / 8.23 m aft of break)
    - Mid (50 %):  25.00 ft / 7.62 m
    - Quarterdeck (15 %): 25.00 ft / 7.62 m
    - Stern:  25.00 ft / 7.62 m
    - Average freeboard: 25.86 ft / 7.88 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 66.8 %
  - Above water (accommodation/working, high = better): 193.0 %
 Waterplane Area: 105,490 Square feet or 9,800 Square metres
 Displacement factor (Displacement / loading): 102 %
 Structure weight / hull surface area: 274 lbs/sq ft or 1,339 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.25
  - 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