A extremely fast ship: GB/CB/1921

I apologize for beating on the large, fast ship topic so hard, but what I have today explores the outer limits of what is possible. I actually suspect that even faster is possible. This is a 42-knot design, with the lightest machinery, that has an 8in armour basis and 6-14in/50, 16-5.5in QF, 6-4.7in AA, and 32-40mm AA guns. The freeboard is quite high and the displacement was reduced. I was pleasantly surprised that the protection and machinery size are as good as they are. This is the Springsharp 3.0b1 Beta report:

GB/CB/1921, Great Britain Battlecruiser laid down 1921 (Engine 1950)

Displacement:
 45,537 t light; 47,389 t standard; 49,064 t normal; 50,405 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (929.48 ft / 924.00 ft) x 118.00 ft x (35.00 / 35.65 ft)
 (283.31 m / 281.64 m) x 35.97 m  x (10.67 / 10.87 m)

Armament:
      6 - 14.00" / 356 mm 50.0 cal guns - 1,452.00lbs / 658.62kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts , 1921 Model
   2 x Triple mounts on centreline, forward evenly spread
  1 raised mount
      16 - 5.50" / 140 mm 45.0 cal guns - 85.00lbs / 38.56kg shells, 150 per gun
   Quick firing guns in turret on barbette mounts , 1921 Model
   8 x Twin mounts on sides, evenly spread
  4 raised mounts
      6 - 4.70" / 119 mm 45.0 cal guns - 52.35lbs / 23.75kg shells, 150 per gun
   Anti-air guns in deck and hoist mounts , 1921 Model
   6 x Single mounts on sides, aft deck forward
  6 raised mounts
      32 - 1.57" / 40.0 mm 45.0 cal guns - 2.00lbs / 0.91kg shells, 150 per gun
   Anti-air guns in deck mounts , 1921 Model
   8 x 4 row quad mounts on sides, evenly spread
  6 raised mounts
 Weight of broadside 10,450 lbs / 10,450 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 8.00" / 203 mm 570.00 ft / 173.74 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 570.00 ft / 173.74 m 35.00 ft / 10.67 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 5.00" / 127 mm  8.00" / 203 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 8 shafts, 476,598 shp / 355,542 Kw = 42.00 kts
 Range 5,600nm at 15.00 kts
 Bunker at max displacement = 3,015 tons

Complement:
 1,647 - 2,142

Cost:
 £10.829 million / $43.317 million

Distribution of weights at normal displacement:
 Armament: 2,054 tons, 4.2 %
 Armour: 11,064 tons, 22.5 %
    - Belts: 3,125 tons, 6.4 %
    - Torpedo bulkhead: 1,476 tons, 3.0 %
    - Armament: 2,222 tons, 4.5 %
    - Armour Deck: 4,010 tons, 8.2 %
    - Conning Tower: 231 tons, 0.5 %
 Machinery: 11,402 tons, 23.2 %
 Hull, fittings & equipment: 21,804 tons, 44.4 %
 Fuel, ammunition & stores: 3,527 tons, 7.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   67,884 lbs / 30,792 Kg = 49.5 x 14.0 " / 356 mm shells or 8.2 torpedoes
 Stability (Unstable if below 1.00): 1.22
 Metacentric height 9.3 ft / 2.8 m
 Roll period: 16.3 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.34
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has raised forecastle, rise forward of midbreak,
   a normal bow and large transom stern
 Block coefficient (normal/deep): 0.450 / 0.454
 Length to Beam Ratio: 7.83 : 1
 'Natural speed' for length: 35.64 kts
 Power going to wave formation at top speed: 61 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 8.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  39.00 ft / 11.89 m,  34.00 ft / 10.36 m
    - Forward deck: 30.00 %,  33.00 ft / 10.06 m,  34.00 ft / 10.36 m
    - Aft deck: 35.00 %,  33.00 ft / 10.06 m,  33.00 ft / 10.06 m
    - Quarter deck: 15.00 %,  33.00 ft / 10.06 m,  34.00 ft / 10.36 m
    - Average freeboard:  33.83 ft / 10.31 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 115.3 %
  - Above water (accommodation/working, high = better): 277.6 %
 Waterplane Area: 72,244 Square feet or 6,712 Square metres
 Displacement factor (Displacement / loading): 112 %
 Structure weight / hull surface area: 205 lbs/sq ft or 999 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.93
  - Longitudinal: 1.83
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent