Another GB/CB/1915 design study

I have enough information for a new version of the GB/CB/1915 specification, based on an armouring plan, a hull cross section, and the original sketch design, that I can do a more accurate version. This depends heavily on using the lightest machinery possible. The lower belt, very short in length is 9in, with the rest being 5in. The deck is quite thick at 6in, amidships. The guns are 8-15in/45 and 16-5in QF guns (not real guns). The speed is just 32 knots. This is the Springsharp report:

GB/CB/1915 Design Study, Great Britain Battlecruiser laid down 1915 (Engine 1950)

Displacement:
 36,763 t light; 38,961 t standard; 40,748 t normal; 42,177 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (855.70 ft / 850.00 ft) x 105.00 ft x (26.50 / 27.26 ft)
 (260.82 m / 259.08 m) x 32.00 m  x (8.08 / 8.31 m)

Armament:
      8 - 15.00" / 381 mm 45.0 cal guns - 1,950.00lbs / 884.51kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1915 Model
   4 x Twin mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
      16 - 5.00" / 127 mm 45.0 cal guns - 62.00lbs / 28.12kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1915 Model
   16 x Single mounts on sides amidships
  4 raised mounts
      Weight of broadside 16,592 lbs / 7,526 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 9.00" / 229 mm 300.00 ft / 91.44 m 9.00 ft / 2.74 m
 Ends: 5.00" / 127 mm 230.00 ft / 70.10 m 9.00 ft / 2.74 m
   320.00 ft / 97.54 m Unarmoured ends
 Upper: 5.00" / 127 mm 300.00 ft / 91.44 m 8.00 ft / 2.44 m
   Main Belt covers 54 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 530.00 ft / 161.54 m 26.50 ft / 8.08 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 9.00" / 229 mm 5.00" / 127 mm  9.00" / 229 mm
 2nd: 4.00" / 102 mm 2.00" / 51 mm  4.00" / 102 mm

   - Armoured deck - multiple decks: 6.00" / 152 mm For and Aft decks
 Forecastle: 3.00" / 76 mm  Quarter deck: 3.00" / 76 mm

   - Conning towers: Forward 9.00" / 229 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 189,864 shp / 141,639 Kw = 32.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 3,217 tons

Complement:
 1,433 - 1,864

Cost:
 £4.783 million / $19.130 million

Distribution of weights at normal displacement:
 Armament: 2,531 tons, 6.2 %
 Armour: 12,171 tons, 29.9 %
    - Belts: 2,141 tons, 5.3 %
    - Torpedo bulkhead: 1,039 tons, 2.6 %
    - Armament: 2,569 tons, 6.3 %
    - Armour Deck: 6,191 tons, 15.2 %
    - Conning Tower: 230 tons, 0.6 %
 Machinery: 4,542 tons, 11.1 %
 Hull, fittings & equipment: 17,519 tons, 43.0 %
 Fuel, ammunition & stores: 3,985 tons, 9.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   72,626 lbs / 32,943 Kg = 43.0 x 15.0 " / 381 mm shells or 10.7 torpedoes
 Stability (Unstable if below 1.00): 1.15
 Metacentric height 7.0 ft / 2.1 m
 Roll period: 16.7 seconds
 Steadiness - As gun platform (Average = 50 %): 60 %
   - Recoil effect (Restricted arc if above 1.00): 0.79
 Seaboat quality  (Average = 1.00): 1.21

Hull form characteristics:
 Hull has rise forward of midbreak,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.603 / 0.607
 Length to Beam Ratio: 8.10 : 1
 'Natural speed' for length: 29.15 kts
 Power going to wave formation at top speed: 52 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 9.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 36.00 %,  36.00 ft / 10.97 m,  31.00 ft / 9.45 m
    - Forward deck: 30.00 %,  31.00 ft / 9.45 m,  31.00 ft / 9.45 m
    - Aft deck: 19.00 %,  23.00 ft / 7.01 m,  23.00 ft / 7.01 m
    - Quarter deck: 15.00 %,  23.00 ft / 7.01 m,  23.00 ft / 7.01 m
    - Average freeboard:  29.00 ft / 8.84 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 84.6 %
  - Above water (accommodation/working, high = better): 242.7 %
 Waterplane Area: 65,459 Square feet or 6,081 Square metres
 Displacement factor (Displacement / loading): 119 %
 Structure weight / hull surface area: 200 lbs/sq ft or 974 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.30
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily