The Ger/BB/1916 design study

I have a specification for a design study of a German battleship, circa 1916, with 9-16.5in guns. The guns are 130 tons and fire a 2,480 lbs shot at 2,800 ft/sec. The ship is 755ft x 110ft x 32ft. The ship has a 120,000 SHP power plant. According to Springsharp, that will drive the ship at 27 knots, which is at the lower end of a fast battleship speed. I went with 16in armour basis, as there seemed to be excess capacity in the design. This is the weight specification:

18,000 tons hull
 4,000 tons Armament
 2,670 tons Machinery
16,730 tons Protection
 3,600 tons Miscellaneous

This is the Springsharp report:

Ger/BB/1916, Germany Battleship laid down 1916 (Engine 1931)

Displacement:
 42,916 t light; 45,855 t standard; 49,811 t normal; 52,976 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (759.00 ft / 755.00 ft) x 110.00 ft x (32.00 / 33.73 ft)
 (231.34 m / 230.12 m) x 33.53 m  x (9.75 / 10.28 m)

Armament:
      9 - 16.50" / 419 mm 45.0 cal guns - 2,480.00lbs / 1,124.91kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1916 Model
   3 x Triple mounts on centreline, forward deck forward
  1 raised mount - superfiring
      10 - 6.00" / 152 mm 50.0 cal guns - 100.00lbs / 45.36kg shells, 150 per gun
   Quick firing guns in deck and hoist mount, 1916 Model
   1 x Single mount on sides, aft deck forward
  2 raised mounts
      Weight of broadside 23,320 lbs / 10,578 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 16.0" / 406 mm 430.00 ft / 131.06 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 12.0" / 305 mm 430.00 ft / 131.06 m 8.00 ft / 2.44 m
   Main Belt covers 88 % of normal length

   - Torpedo Bulkhead:
  4.00" / 102 mm 430.00 ft / 131.06 m 32.00 ft / 9.75 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 16.0" / 406 mm 10.0" / 254 mm  16.0" / 406 mm
 2nd: 5.00" / 127 mm 3.00" / 76 mm  5.00" / 127 mm

   - Armoured deck - multiple decks: 5.00" / 127 mm For and Aft decks
 Forecastle: 5.00" / 127 mm  Quarter deck: 5.00" / 127 mm

   - Conning towers: Forward 16.00" / 406 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 118,331 shp / 88,275 Kw = 27.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 7,120 tons

Complement:
 1,666 - 2,167

Cost:
 £6.574 million / $26.296 million

Distribution of weights at normal displacement:
 Armament: 3,605 tons, 7.2 %
 Armour: 17,364 tons, 34.9 %
    - Belts: 4,622 tons, 9.3 %
    - Torpedo bulkhead: 2,036 tons, 4.1 %
    - Armament: 4,286 tons, 8.6 %
    - Armour Deck: 5,953 tons, 12.0 %
    - Conning Tower: 467 tons, 0.9 %
 Machinery: 3,539 tons, 7.1 %
 Hull, fittings & equipment: 18,408 tons, 37.0 %
 Fuel, ammunition & stores: 6,895 tons, 13.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   84,868 lbs / 38,496 Kg = 37.8 x 16.5 " / 419 mm shells or 15.0 torpedoes
 Stability (Unstable if below 1.00): 1.16
 Metacentric height 7.7 ft / 2.3 m
 Roll period: 16.7 seconds
 Steadiness - As gun platform (Average = 50 %): 64 %
   - Recoil effect (Restricted arc if above 1.00): 0.83
 Seaboat quality  (Average = 1.00): 1.29

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.656 / 0.662
 Length to Beam Ratio: 6.86 : 1
 'Natural speed' for length: 27.48 kts
 Power going to wave formation at top speed: 51 %
 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 (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 30.00 %,  29.00 ft / 8.84 m,  26.00 ft / 7.92 m
    - Forward deck: 20.00 %,  26.00 ft / 7.92 m,  26.00 ft / 7.92 m
    - Aft deck: 19.00 %,  26.00 ft / 7.92 m,  26.00 ft / 7.92 m
    - Quarter deck: 31.00 %,  18.00 ft / 5.49 m,  18.00 ft / 5.49 m
    - Average freeboard:  23.88 ft / 7.28 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 75.6 %
  - Above water (accommodation/working, high = better): 190.2 %
 Waterplane Area: 63,972 Square feet or 5,943 Square metres
 Displacement factor (Displacement / loading): 114 %
 Structure weight / hull surface area: 225 lbs/sq ft or 1,096 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.55
  - 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