The GB/CB/1916 design study

I have this sketch design of a 1921-like British battle cruiser, without a designation, but clearly intended to be some date like 1916. This is the original specification:

GB/CB/1916 C-0.24 (hull weight coeff.) 48,000 tons 9-16in (105 tons) 20-5in (5 ton)
30 knots  855ft x 105ft x 33.3ft  Hull depth=58ft
143,500 SHP
Weights
 1,780 tons   Aux Mach
 4,783 tons   Machinery
12,500 tons   Hull
 2,410 tons   Armament
22,687 tons   Protection
 3,840 tons   Miscellaneous

This is the Springsharp report for my implementation of this specification:

GB/CB/1916, Great Britain Battlecruiser laid down 1916 (Engine 1950)

Displacement:
 44,588 t light; 46,621 t standard; 49,967 t normal; 52,644 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (860.20 ft / 855.00 ft) x 105.00 ft x (33.30 / 34.71 ft)
 (262.19 m / 260.60 m) x 32.00 m  x (10.15 / 10.58 m)

Armament:
      9 - 16.00" / 406 mm 45.0 cal guns - 2,065.00lbs / 936.67kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1916 Model
   3 x Triple mounts on centreline ends, majority forward
  1 raised mount - superfiring
   Main guns limited to end-on fire
      20 - 5.00" / 127 mm 45.0 cal guns - 63.00lbs / 28.58kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1916 Model
   10 x Twin mounts on sides amidships
  4 raised mounts
      Weight of broadside 19,845 lbs / 9,002 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 14.0" / 356 mm 450.00 ft / 137.16 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 81 % of normal length

   - Torpedo Bulkhead:
  5.00" / 127 mm 450.00 ft / 137.16 m 33.30 ft / 10.15 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: 5.00" / 127 mm 4.00" / 102 mm  5.00" / 127 mm

   - Armoured deck - multiple decks: 5.00" / 127 mm For and Aft decks
 Forecastle: 5.00" / 127 mm  Quarter deck: 5.00" / 127 mm

   - Conning towers: Forward 12.00" / 305 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 152,135 shp / 113,493 Kw = 30.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 6,023 tons

Complement:
 1,670 - 2,172

Cost:
 £6.419 million / $25.676 million

Distribution of weights at normal displacement:
 Armament: 3,287 tons, 6.6 %
 Armour: 17,679 tons, 35.4 %
    - Belts: 4,446 tons, 8.9 %
    - Torpedo bulkhead: 2,772 tons, 5.5 %
    - Armament: 3,924 tons, 7.9 %
    - Armour Deck: 6,187 tons, 12.4 %
    - Conning Tower: 351 tons, 0.7 %
 Machinery: 3,640 tons, 7.3 %
 Hull, fittings & equipment: 19,982 tons, 40.0 %
 Fuel, ammunition & stores: 5,380 tons, 10.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   97,240 lbs / 44,107 Kg = 47.5 x 16.0 " / 406 mm shells or 17.7 torpedoes
 Stability (Unstable if below 1.00): 1.05
 Metacentric height 5.9 ft / 1.8 m
 Roll period: 18.1 seconds
 Steadiness - As gun platform (Average = 50 %): 81 %
   - Recoil effect (Restricted arc if above 1.00): 1.21
 Seaboat quality  (Average = 1.00): 1.63

Hull form characteristics:
 Hull has a flush deck,
   a normal bow and small transom stern
 Block coefficient (normal/deep): 0.585 / 0.591
 Length to Beam Ratio: 8.14 : 1
 'Natural speed' for length: 31.50 kts
 Power going to wave formation at top speed: 49 %
 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: 25.00 %,  37.00 ft / 11.28 m,  32.00 ft / 9.75 m
    - Forward deck: 30.00 %,  32.00 ft / 9.75 m,  31.00 ft / 9.45 m
    - Aft deck: 30.00 %,  31.00 ft / 9.45 m,  31.00 ft / 9.45 m
    - Quarter deck: 15.00 %,  31.00 ft / 9.45 m,  32.00 ft / 9.75 m
    - Average freeboard:  31.98 ft / 9.75 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 71.2 %
  - Above water (accommodation/working, high = better): 236.6 %
 Waterplane Area: 66,372 Square feet or 6,166 Square metres
 Displacement factor (Displacement / loading): 117 %
 Structure weight / hull surface area: 213 lbs/sq ft or 1,038 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.73
  - 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
 Excellent seaboat, comfortable, can fire her guns in the heaviest weather