This German battleship design study almost ended up as a CDV

In order to make my design for a German battleship, circa 1915 (although it looks more modern), I had to reduce freeboard and range. I was starting to think that to achieve the desired protection, it was turning into a low freeboard coast defense battleship. It is short and wide, so it qualifies in that regard. This is the Springsharp report that shows what I had to do to achieve sufficient stability and hull strength:

Ger/BB/1915 Design Study, Germany Battleship laid down 1915

Displacement:
 44,889 t light; 47,018 t standard; 48,500 t normal; 49,686 t full load

Dimensions: Length overall / water x beam x draught
 680.98 ft / 680.00 ft x 120.00 ft x 33.00 ft (normal load)
 207.56 m / 207.26 m x 36.58 m  x 10.06 m

Armament:
      12 - 16.00" / 406 mm guns (4x3 guns), 2,048.00lbs / 928.96kg shells, 1915 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      20 - 5.00" / 127 mm guns (12 mounts), 62.50lbs / 28.35kg shells, 1915 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships, 12 raised mounts - superfiring
 Weight of broadside 25,826 lbs / 11,714 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 18.0" / 457 mm 380.00 ft / 115.82 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 86 % of normal length

   - Torpedo Bulkhead:
  3.00" / 76 mm 380.00 ft / 115.82 m 31.00 ft / 9.45 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 12.0" / 305 mm 8.00" / 203 mm  18.0" / 457 mm
 2nd: 5.00" / 127 mm 4.00" / 102 mm  5.00" / 127 mm

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

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 46,317 shp / 34,553 Kw = 21.00 kts
 Range 4,900nm at 12.00 kts
 Bunker at max displacement = 2,668 tons

Complement:
 1,633 - 2,124

Cost:
 £6.587 million / $26.347 million

Distribution of weights at normal displacement:
 Armament: 3,228 tons, 6.7 %
 Armour: 21,697 tons, 44.7 %
    - Belts: 5,383 tons, 11.1 %
    - Torpedo bulkhead: 1,308 tons, 2.7 %
    - Armament: 5,405 tons, 11.1 %
    - Armour Deck: 9,086 tons, 18.7 %
    - Conning Tower: 516 tons, 1.1 %
 Machinery: 1,754 tons, 3.6 %
 Hull, fittings & equipment: 18,208 tons, 37.5 %
 Fuel, ammunition & stores: 3,611 tons, 7.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   67,145 lbs / 30,456 Kg = 32.8 x 16.0 " / 406 mm shells or 12.9 torpedoes
 Stability (Unstable if below 1.00): 1.06
 Metacentric height 7.4 ft / 2.3 m
 Roll period: 18.5 seconds
 Steadiness - As gun platform (Average = 50 %): 62 %
   - Recoil effect (Restricted arc if above 1.00): 0.55
 Seaboat quality  (Average = 1.00): 1.25

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.630
 Length to Beam Ratio: 5.67 : 1
 'Natural speed' for length: 26.08 kts
 Power going to wave formation at top speed: 42 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 2.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  28.00 ft / 8.53 m
    - Forecastle (20 %): 18.00 ft / 5.49 m
    - Mid (50 %):  18.00 ft / 5.49 m
    - Quarterdeck (15 %): 18.00 ft / 5.49 m
    - Stern:  18.00 ft / 5.49 m
    - Average freeboard: 18.80 ft / 5.73 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 73.8 %
  - Above water (accommodation/working, high = better): 128.9 %
 Waterplane Area: 61,391 Square feet or 5,703 Square metres
 Displacement factor (Displacement / loading): 95 %
 Structure weight / hull surface area: 231 lbs/sq ft or 1,128 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.38
  - 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