A new attempt at the Ger/CB/1915A design study

I have this radical battlecruiser design that is titled "Ger/CB/15A" from the early 1970's. I have tried this before, but I had not tried to replicate the weights that I had listed. The dimensions specified were 961ft x 110ft x 31.7ft, with a hull depth of 50ft. The displacment specified was 47,550 tons standard, with 50,000 tons full load. I quickly found the hull weight was inadequate. The normal displacment had to be increased to 53,250 tons for acceptable hull strength. These are the original weights:

Hull:       12,685 tons
Machinery:   6,000 tons
Aux. Mach.:  1,800 tons
Protection: 20,317 tons
Armament:    2,148 tons
Misc.:       3,600 tons
Fuel Oil:    3,000 tons
Feed Water:    450 tons

This is the Springsharp report:

Ger/CB/1915A, Enter country Enter ship type laid down 1915 (Engine 1950)

Displacement:
 49,665 t light; 51,396 t standard; 53,250 t normal; 54,733 t full load

Dimensions: Length overall / water x beam x draught
 963.24 ft / 961.00 ft x 110.00 ft x 31.70 ft (normal load)
 293.59 m / 292.91 m x 33.53 m  x 9.66 m

Armament:
      6 - 16.50" / 419 mm guns (2x3 guns), 2,246.06lbs / 1,018.80kg shells, 1915 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all forward, 1 raised mount - superfiring
      20 - 5.00" / 127 mm guns (10x2 guns), 62.50lbs / 28.35kg shells, 1915 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships, 6 raised mounts - superfiring
 Weight of broadside 14,726 lbs / 6,680 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 570.00 ft / 173.74 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 91 % of normal length

   - Torpedo Bulkhead:
  3.00" / 76 mm 570.00 ft / 173.74 m 29.00 ft / 8.84 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 14.0" / 356 mm 8.00" / 203 mm  14.0" / 356 mm
 2nd: 5.00" / 127 mm 5.00" / 127 mm  5.00" / 127 mm

   - Armour deck: 7.00" / 178 mm, Conning tower: 12.00" / 305 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 262,207 shp / 195,606 Kw = 34.00 kts
 Range 5,600nm at 15.00 kts
 Bunker at max displacement = 3,337 tons

Complement:
 1,752 - 2,278

Cost:
 £6.055 million / $24.220 million

Distribution of weights at normal displacement:
 Armament: 1,841 tons, 3.5 %
 Armour: 20,309 tons, 38.1 %
    - Belts: 4,992 tons, 9.4 %
    - Torpedo bulkhead: 1,835 tons, 3.4 %
    - Armament: 3,507 tons, 6.6 %
    - Armour Deck: 9,609 tons, 18.0 %
    - Conning Tower: 366 tons, 0.7 %
 Machinery: 6,273 tons, 11.8 %
 Hull, fittings & equipment: 21,242 tons, 39.9 %
 Fuel, ammunition & stores: 3,585 tons, 6.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   87,670 lbs / 39,766 Kg = 39.0 x 16.5 " / 419 mm shells or 14.1 torpedoes
 Stability (Unstable if below 1.00): 1.15
 Metacentric height 7.5 ft / 2.3 m
 Roll period: 16.9 seconds
 Steadiness - As gun platform (Average = 50 %): 58 %
   - Recoil effect (Restricted arc if above 1.00): 0.49
 Seaboat quality  (Average = 1.00): 1.17

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.556
 Length to Beam Ratio: 8.74 : 1
 'Natural speed' for length: 31.00 kts
 Power going to wave formation at top speed: 51 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 4.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  32.00 ft / 9.75 m
    - Forecastle (20 %): 25.00 ft / 7.62 m
    - Mid (50 %):  25.00 ft / 7.62 m
    - Quarterdeck (15 %): 25.00 ft / 7.62 m
    - Stern:  25.00 ft / 7.62 m
    - Average freeboard: 25.56 ft / 7.79 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 78.9 %
  - Above water (accommodation/working, high = better): 201.7 %
 Waterplane Area: 74,202 Square feet or 6,894 Square metres
 Displacement factor (Displacement / loading): 112 %
 Structure weight / hull surface area: 203 lbs/sq ft or 993 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.99
  - Longitudinal: 1.05
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent