The GB/BB/1900 battleship design

Springsharp 3.0b1 Beta is really a good tool. I just tried the GB/BB/1900 (or whatever the date is) and it worked really well. This is a battleship with 4-12in/40 and 12-6in QF guns and a 18 knot speed. The belt is 12in. This is the Springsharp report:

GB/BB/1900, Great Britain Battleship laid down 1900

Displacement:
 11,645 t light; 12,216 t standard; 14,597 t normal; 16,502 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (445.00 ft / 435.00 ft) x 75.00 ft x (29.00 / 31.96 ft)
 (135.64 m / 132.59 m) x 22.86 m  x (8.84 / 9.74 m)

Armament:
      4 - 12.00" / 305 mm 40.0 cal guns - 850.00lbs / 385.55kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts , 1900 Model
   2 x Single mounts on centreline ends, evenly spread
      12 - 6.00" / 152 mm 45.0 cal guns - 108.92lbs / 49.41kg shells, 150 per gun
   Quick firing guns in casemate mounts , 1900 Model
   12 x Single mounts on sides, evenly spread
  4 hull mounts in casemates- Limited use in heavy seas
 Weight of broadside 4,707 lbs / 4,707 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 250.00 ft / 76.20 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 8.00" / 203 mm 250.00 ft / 76.20 m 8.00 ft / 2.44 m
   Main Belt covers 88 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 250.00 ft / 76.20 m 29.00 ft / 8.84 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 12.0" / 305 mm 7.00" / 178 mm  9.00" / 229 mm
 2nd: 6.00" / 152 mm 6.00" / 152 mm  6.00" / 152 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 9.00" / 229 mm

Machinery:
 Coal and oil fired boilers, reciprocating cruising steam engines plus steam turbines, 
 ERROR: Revise drives, 2 shafts, 13,376 ihp / 9,978 Kw = 18.00 kts
 Range 6,500nm at 14.00 kts
 Bunker at max displacement = 4,286 tons (100% coal)

Complement:
 663 - 863

Cost:
 £1.104 million / $4.417 million

Distribution of weights at normal displacement:
 Armament: 866 tons, 5.9 %
 Armour: 4,410 tons, 30.2 %
    - Belts: 1,823 tons, 12.5 %
    - Torpedo bulkhead: 268 tons, 1.8 %
    - Armament: 951 tons, 6.5 %
    - Armour Deck: 1,252 tons, 8.6 %
    - Conning Tower: 116 tons, 0.8 %
 Machinery: 2,572 tons, 17.6 %
 Hull, fittings & equipment: 4,263 tons, 29.2 %
 Fuel, ammunition & stores: 2,952 tons, 20.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   19,629 lbs / 8,904 Kg = 22.7 x 12.0 " / 305 mm shells or 3.1 torpedoes
 Stability (Unstable if below 1.00): 1.46
 Metacentric height 6.2 ft / 1.9 m
 Roll period: 12.6 seconds
 Steadiness - As gun platform (Average = 50 %): 80 %
   - Recoil effect (Restricted arc if above 1.00): 0.36
 Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
 Hull has a flush deck,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.540 / 0.554
 Length to Beam Ratio: 5.80 : 1
 'Natural speed' for length: 20.86 kts
 Power going to wave formation at top speed: 43 %
 Trim (Max stability = 0, Max steadiness = 100): 40
 Bow angle (Positive = bow angles forward): -4.00 degrees
 Stern overhang: -4.00 ft / -1.22 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 25.00 %,  20.00 ft / 6.10 m,  18.00 ft / 5.49 m
    - Forward deck: 30.00 %,  18.00 ft / 5.49 m,  17.00 ft / 5.18 m
    - Aft deck: 25.00 %,  17.00 ft / 5.18 m,  17.00 ft / 5.18 m
    - Quarter deck: 20.00 %,  17.00 ft / 5.18 m,  18.00 ft / 5.49 m
    - Average freeboard:  17.70 ft / 5.39 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 107.8 %
  - Above water (accommodation/working, high = better): 111.9 %
 Waterplane Area: 22,557 Square feet or 2,096 Square metres
 Displacement factor (Displacement / loading): 114 %
 Structure weight / hull surface area: 124 lbs/sq ft or 605 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.90
  - Longitudinal: 2.52
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is adequate
 Ship has slow, easy roll, a good, steady gun platform
 Excellent seaboat, comfortable, can fire her guns in the heaviest weather