Springsharp report for a "British Amagi"

I tried the ship I suggested in Springhsharp. I found that I needed to raise the displacment a great deal, for the design to be acceptable in Springsharp:

GB/CB/1921, Great Britain Battlecruiser laid down 1921

Displacement:
 42,912 t light; 44,987 t standard; 47,500 t normal; 49,510 t full load

Dimensions: Length overall / water x beam x draught
 814.00 ft / 814.00 ft x 104.00 ft x 29.00 ft (normal load)
 248.11 m / 248.11 m x 31.70 m  x 8.84 m

Armament:
      8 - 16.00" / 406 mm guns (4x2 guns), 2,048.00lbs / 928.96kg shells, 1921 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      2 - 16.00" / 406 mm guns (1x2 guns), 2,048.00lbs / 928.96kg shells, 1921 Model
   Breech loading guns in a turret (on a barbette)
   on side amidships
      14 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1921 Model
   Quick firing guns in casemate mounts 
   on side, evenly spread
   14 guns in hull casemates - Limited use in heavy seas
 Weight of broadside 21,992 lbs / 9,975 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 505.00 ft / 153.92 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 95 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 505.00 ft / 153.92 m 29.00 ft / 8.84 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 12.0" / 305 mm 9.00" / 229 mm  12.0" / 305 mm
 2nd: 12.0" / 305 mm 9.00" / 229 mm  12.0" / 305 mm
 3rd: 6.00" / 152 mm 4.00" / 102 mm  6.00" / 152 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 12.00" / 305 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 168,959 shp / 126,044 Kw = 30.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 4,523 tons

Complement:
 1,608 - 2,091

Cost:
 £11.774 million / $47.097 million

Distribution of weights at normal displacement:
 Armament: 2,749 tons, 5.8 %
 Armour: 15,044 tons, 31.7 %
    - Belts: 4,203 tons, 8.8 %
    - Torpedo bulkhead: 1,084 tons, 2.3 %
    - Armament: 4,499 tons, 9.5 %
    - Armour Deck: 4,919 tons, 10.4 %
    - Conning Tower: 339 tons, 0.7 %
 Machinery: 5,818 tons, 12.2 %
 Hull, fittings & equipment: 19,301 tons, 40.6 %
 Fuel, ammunition & stores: 4,588 tons, 9.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   58,612 lbs / 26,586 Kg = 28.6 x 16.0 " / 406 mm shells or 7.6 torpedoes
 Stability (Unstable if below 1.00): 1.12
 Metacentric height 6.6 ft / 2.0 m
 Roll period: 17.0 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.78
 Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.677
 Length to Beam Ratio: 7.83 : 1
 'Natural speed' for length: 28.53 kts
 Power going to wave formation at top speed: 53 %
 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:  31.00 ft / 9.45 m
    - Forecastle (20 %): 28.00 ft / 8.53 m
    - Mid (50 %):  28.00 ft / 8.53 m (20.00 ft / 6.10 m aft of break)
    - Quarterdeck (15 %): 20.00 ft / 6.10 m
    - Stern:  20.00 ft / 6.10 m
    - Average freeboard: 24.24 ft / 7.39 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 102.9 %
  - Above water (accommodation/working, high = better): 186.6 %
 Waterplane Area: 66,477 Square feet or 6,176 Square metres
 Displacement factor (Displacement / loading): 98 %
 Structure weight / hull surface area: 213 lbs/sq ft or 1,038 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.99
  - Longitudinal: 1.09
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent