The Ger/BB/1907 design

I just ran the Ger/BB/1907 design in Springsharp. The ship had to be somewhat larger, but the main issue was hull strength. That motivated a deeper draft, to achieve more hull depth, and greater displacement to add strength. This is the Springsharp report:

Ger/BB/1907, Germany Battleship laid down 1907 (Engine 1909)

Displacement:
 23,830 t light; 24,684 t standard; 26,250 t normal; 27,503 t full load

Dimensions: Length overall / water x beam x draught
 620.00 ft / 620.00 ft x 105.00 ft x 32.00 ft (normal load)
 188.98 m / 188.98 m x 32.00 m  x 9.75 m

Armament:
      8 - 12.00" / 305 mm guns (4x2 guns), 864.00lbs / 391.90kg shells, 1907 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      12 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1907 Model
   Quick firing guns in deck mounts with hoists
   on side, evenly spread
 Weight of broadside 7,296 lbs / 3,309 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 13.0" / 330 mm 400.00 ft / 121.92 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 8.00" / 203 mm 400.00 ft / 121.92 m 8.00 ft / 2.44 m
   Main Belt covers 99 % of normal length

   - Torpedo Bulkhead:
  1.50" / 38 mm 400.00 ft / 121.92 m 27.00 ft / 8.23 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 13.0" / 330 mm 10.0" / 254 mm  13.0" / 330 mm
 2nd: 2.00" / 51 mm       -         -

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

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 50,116 shp / 37,387 Kw = 24.00 kts
 Range 4,500nm at 14.00 kts
 Bunker at max displacement = 2,819 tons

Complement:
 1,030 - 1,340

Cost:
 £1.919 million / $7.676 million

Distribution of weights at normal displacement:
 Armament: 912 tons, 3.5 %
 Armour: 9,813 tons, 37.4 %
    - Belts: 3,161 tons, 12.0 %
    - Torpedo bulkhead: 599 tons, 2.3 %
    - Armament: 2,755 tons, 10.5 %
    - Armour Deck: 3,051 tons, 11.6 %
    - Conning Tower: 247 tons, 0.9 %
 Machinery: 2,278 tons, 8.7 %
 Hull, fittings & equipment: 10,827 tons, 41.2 %
 Fuel, ammunition & stores: 2,420 tons, 9.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   53,442 lbs / 24,241 Kg = 61.9 x 12.0 " / 305 mm shells or 10.1 torpedoes
 Stability (Unstable if below 1.00): 1.02
 Metacentric height 5.6 ft / 1.7 m
 Roll period: 18.6 seconds
 Steadiness - As gun platform (Average = 50 %): 100 %
   - Recoil effect (Restricted arc if above 1.00): 0.60
 Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.441
 Length to Beam Ratio: 5.90 : 1
 'Natural speed' for length: 24.90 kts
 Power going to wave formation at top speed: 46 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -1.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  31.00 ft / 9.45 m
    - Forecastle (20 %): 29.00 ft / 8.84 m
    - Mid (68 %):  29.00 ft / 8.84 m (21.00 ft / 6.40 m aft of break)
    - Quarterdeck (15 %): 21.00 ft / 6.40 m
    - Stern:  21.00 ft / 6.40 m
    - Average freeboard: 26.60 ft / 8.11 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 67.7 %
  - Above water (accommodation/working, high = better): 205.1 %
 Waterplane Area: 41,227 Square feet or 3,830 Square metres
 Displacement factor (Displacement / loading): 121 %
 Structure weight / hull surface area: 177 lbs/sq ft or 867 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.90
  - Longitudinal: 2.52
  - 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
 Excellent seaboat, comfortable, can fire her guns in the heaviest weather