The GB/BB/1909 design study

I made a design study for the British battleship, circa 1909, that had 6-13.5in/45 and 12-6in QF guns. Actually, the secondary armament was unspecified, and this is what I would have used, now. The design in the spirit of my friend Cliff's 12in-gunned battleships. These were the original design weights:

Machinery        2,900 tons
Protection      10,496 tons
Hull            12,180 tons
Armament         1,104 tons
Miscellaneous    2,230 tons

These were the Springsharp design weights:

Machinery        4,023 tons
Protection       9,583 tons
Hull            10,184 tons
Armament         1,683 tons
Miscellaneous    4,241 tons

This is the full Springsharp report:

GB/BB/1909, Great Britain Battleship laid down 1909

Displacement:
 24,788 t light; 25,858 t standard; 29,029 t normal; 31,566 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (628.00 ft / 620.00 ft) x 95.00 ft x (30.00 / 32.11 ft)
 (191.41 m / 188.98 m) x 28.96 m  x (9.14 / 9.79 m)

Armament:
      6 - 13.50" / 343 mm 45.0 cal guns - 1,250.00lbs / 566.99kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts , 1909 Model
   3 x Twin mounts on centreline ends, majority forward
      12 - 6.00" / 152 mm 50.0 cal guns - 114.33lbs / 51.86kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts , 1909 Model
   12 x Single mounts on sides, evenly spread
  2 raised mounts
 Weight of broadside 8,872 lbs / 8,872 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 14.0" / 356 mm 360.00 ft / 109.73 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 10.0" / 254 mm 360.00 ft / 109.73 m 8.00 ft / 2.44 m
   Main Belt covers 89 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 360.00 ft / 109.73 m 30.00 ft / 9.14 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 14.0" / 356 mm 9.00" / 229 mm  14.0" / 356 mm
 2nd: 4.00" / 102 mm 2.00" / 51 mm  4.00" / 102 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 14.00" / 356 mm

Machinery:
 Oil fired boilers, steam turbines, 
 ERROR: Revise drives, 4 shafts, 88,514 shp / 66,032 Kw = 27.00 kts
 Range 7,500nm at 15.00 kts
 Bunker at max displacement = 5,708 tons

Complement:
 1,111 - 1,445

Cost:
 £2.269 million / $9.077 million

Distribution of weights at normal displacement:
 Armament: 1,683 tons, 5.8 %
 Armour: 9,583 tons, 33.0 %
    - Belts: 3,093 tons, 10.7 %
    - Torpedo bulkhead: 799 tons, 2.8 %
    - Armament: 2,292 tons, 7.9 %
    - Armour Deck: 3,114 tons, 10.7 %
    - Conning Tower: 285 tons, 1.0 %
 Machinery: 4,023 tons, 13.9 %
 Hull, fittings & equipment: 10,184 tons, 35.1 %
 Fuel, ammunition & stores: 4,241 tons, 14.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   46,553 lbs / 21,116 Kg = 37.8 x 13.5 " / 343 mm shells or 6.9 torpedoes
 Stability (Unstable if below 1.00): 1.23
 Metacentric height 6.8 ft / 2.1 m
 Roll period: 15.3 seconds
 Steadiness - As gun platform (Average = 50 %): 65 %
   - Recoil effect (Restricted arc if above 1.00): 0.50
 Seaboat quality  (Average = 1.00): 1.30

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.575 / 0.584
 Length to Beam Ratio: 6.53 : 1
 'Natural speed' for length: 24.90 kts
 Power going to wave formation at top speed: 55 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -3.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  28.00 ft / 8.53 m,  26.00 ft / 7.92 m
    - Forward deck: 30.00 %,  26.00 ft / 7.92 m,  26.00 ft / 7.92 m
    - Aft deck: 17.00 %,  26.00 ft / 7.92 m,  26.00 ft / 7.92 m
    - Quarter deck: 33.00 %,  18.00 ft / 5.49 m,  19.00 ft / 5.79 m
    - Average freeboard:  23.69 ft / 7.22 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 90.6 %
  - Above water (accommodation/working, high = better): 187.6 %
 Waterplane Area: 42,081 Square feet or 3,909 Square metres
 Displacement factor (Displacement / loading): 113 %
 Structure weight / hull surface area: 167 lbs/sq ft or 813 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.93
  - Longitudinal: 1.85
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily