The BBX revisited

This is my friend Cliff's concept for a slow, heavily protected and armed super battleship. He called it the "BBX". In this case, we underestimated what could be done on a given displacement. This is the Springsharp report:

GB/BB/1915 BBX, Great Britain Enter ship type laid down 1915 (Engine 1927)

Displacement:
 63,033 t light; 66,113 t standard; 70,000 t normal; 73,109 t full load

Dimensions: Length overall / water x beam x draught
 801.73 ft / 800.00 ft x 135.00 ft x 36.50 ft (normal load)
 244.37 m / 243.84 m x 41.15 m  x 11.13 m

Armament:
      9 - 20.00" / 508 mm guns (3x3 guns), 4,000.00lbs / 1,814.37kg shells, 1915 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      24 - 5.00" / 127 mm guns (12x2 guns), 62.50lbs / 28.35kg shells, 1915 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships, 4 raised mounts - superfiring
 Weight of broadside 37,500 lbs / 17,010 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 18.0" / 457 mm 560.00 ft / 170.69 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 108 % of normal length

   - Torpedo Bulkhead:
  3.00" / 76 mm 560.00 ft / 170.69 m 32.00 ft / 9.75 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 18.0" / 457 mm 11.0" / 279 mm  18.0" / 457 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armour deck: 8.00" / 203 mm, Conning tower: 18.00" / 457 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 66,006 shp / 49,240 Kw = 22.00 kts
 Range 7,500nm at 16.00 kts
 Bunker at max displacement = 6,996 tons

Complement:
 2,151 - 2,797

Cost:
 £9.361 million / $37.442 million

Distribution of weights at normal displacement:
 Armament: 4,688 tons, 6.7 %
 Armour: 28,632 tons, 40.9 %
    - Belts: 7,443 tons, 10.6 %
    - Torpedo bulkhead: 1,989 tons, 2.8 %
    - Armament: 6,614 tons, 9.4 %
    - Armour Deck: 11,927 tons, 17.0 %
    - Conning Tower: 659 tons, 0.9 %
 Machinery: 2,084 tons, 3.0 %
 Hull, fittings & equipment: 27,631 tons, 39.5 %
 Fuel, ammunition & stores: 6,967 tons, 10.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   109,024 lbs / 49,452 Kg = 27.3 x 20.0 " / 508 mm shells or 21.3 torpedoes
 Stability (Unstable if below 1.00): 1.11
 Metacentric height 9.6 ft / 2.9 m
 Roll period: 18.3 seconds
 Steadiness - As gun platform (Average = 50 %): 72 %
   - Recoil effect (Restricted arc if above 1.00): 0.63
 Seaboat quality  (Average = 1.00): 1.45

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.622
 Length to Beam Ratio: 5.93 : 1
 'Natural speed' for length: 28.28 kts
 Power going to wave formation at top speed: 40 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: -1.00 ft / -0.30 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  33.00 ft / 10.06 m
    - Forecastle (20 %): 24.00 ft / 7.32 m
    - Mid (50 %):  23.00 ft / 7.01 m
    - Quarterdeck (15 %): 23.00 ft / 7.01 m
    - Stern:  24.00 ft / 7.32 m
    - Average freeboard: 24.15 ft / 7.36 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 70.2 %
  - Above water (accommodation/working, high = better): 165.8 %
 Waterplane Area: 80,588 Square feet or 7,487 Square metres
 Displacement factor (Displacement / loading): 100 %
 Structure weight / hull surface area: 262 lbs/sq ft or 1,281 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.52
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent
 Ship has slow, easy roll, a good, steady gun platform
 Good seaboat, rides out heavy weather easily