The GB/CB/1908 design for a fast battlecruiser (Corrected)

As usual, the GB/CB/1908 design for a fast battlecruiser with 6-12in guns depends on lightweight machinery. The specification is minimal, giving the Standard displacement as 25,000 tons and the armament as 6-12in guns. The dimensions are only referenced by the displacement calculation. Otherwise, I would have only known the length (750ft). I went with a secondary armament of 10-6in QF guns, as there was nothing given. I suspect that my friend Cliff, who conceived the design, would have had fewer 6in guns. The specification specified 4in-6in armour, so I used that for the upper and lower belt. (The freeboard is higher, still, but corrected to reflect the long forecastle and lower quarterdeck)

GB/CB/1908, Great Britain Battlecruiser laid down 1908 (Engine 1921)

Displacement:
 23,883 t light; 24,753 t standard; 27,400 t normal; 29,518 t full load

Dimensions: Length overall / water x beam x draught
 750.00 ft / 750.00 ft x 80.00 ft x 28.00 ft (normal load)
 228.60 m / 228.60 m x 24.38 m  x 8.53 m

Armament:
      6 - 12.00" / 305 mm guns (3x2 guns), 864.00lbs / 391.90kg shells, 1908 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      10 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1908 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships
 Weight of broadside 6,264 lbs / 2,841 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 465.00 ft / 141.73 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 4.00" / 102 mm 465.00 ft / 141.73 m 8.00 ft / 2.44 m
   Main Belt covers 95 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 465.00 ft / 141.73 m 28.00 ft / 8.53 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 6.00" / 152 mm 4.00" / 102 mm  6.00" / 152 mm
 2nd: 3.00" / 76 mm 3.00" / 76 mm  3.00" / 76 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 201,582 shp / 150,380 Kw = 34.50 kts
 Range 6,700nm at 18.00 kts
 Bunker at max displacement = 4,765 tons

Complement:
 1,064 - 1,384

Cost:
 £2.465 million / $9.862 million

Distribution of weights at normal displacement:
 Armament: 783 tons, 2.9 %
 Armour: 6,098 tons, 22.3 %
    - Belts: 1,574 tons, 5.7 %
    - Torpedo bulkhead: 963 tons, 3.5 %
    - Armament: 1,073 tons, 3.9 %
    - Armour Deck: 2,370 tons, 8.6 %
    - Conning Tower: 117 tons, 0.4 %
 Machinery: 6,942 tons, 25.3 %
 Hull, fittings & equipment: 10,060 tons, 36.7 %
 Fuel, ammunition & stores: 3,517 tons, 12.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   29,848 lbs / 13,539 Kg = 34.5 x 12.0 " / 305 mm shells or 3.4 torpedoes
 Stability (Unstable if below 1.00): 1.19
 Metacentric height 4.9 ft / 1.5 m
 Roll period: 15.1 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.61
 Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.571
 Length to Beam Ratio: 9.38 : 1
 'Natural speed' for length: 27.39 kts
 Power going to wave formation at top speed: 58 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -2.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  32.00 ft / 9.75 m
    - Forecastle (20 %): 28.00 ft / 8.53 m
    - Mid (67 %):  28.00 ft / 8.53 m (20.00 ft / 6.10 m aft of break)
    - Quarterdeck (15 %): 20.00 ft / 6.10 m
    - Stern:  20.00 ft / 6.10 m
    - Average freeboard: 25.68 ft / 7.83 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 138.3 %
  - Above water (accommodation/working, high = better): 197.1 %
 Waterplane Area: 42,700 Square feet or 3,967 Square metres
 Displacement factor (Displacement / loading): 104 %
 Structure weight / hull surface area: 149 lbs/sq ft or 728 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.31
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent