Another extreme battlecruiser

This is based on a very incomplete specification in my "Red Book". The specification simply reads:

700ft x 90ft x 26.5ft
Displacement=24,180ton (I believe that his is standard)
Longitudinal coefficient=0.55
Midship coefficient=0.92
Hull weigbht=9,270 tons
Power=120,000 SHP

Immediately preceding this specification is a page with two designs listed, the German BB with 12-16in guns and 21-22knots speed, and a battlecruiser with 8-15in guns and 28-30 knot speed. My first reaction was to turn this into a light battlecruiser, but I thought better of it, and went with a ship with 8-15in guns and at least 31knot speed. What I produced is only possible with extremely light machinery. This is the resulting Springsharp report:

Ger/CB/1915 Design Study, Germany Battlecruiser laid down 1915 (Engine 1950)

Displacement:
 24,271 t light; 25,301 t standard; 26,250 t normal; 27,009 t full load

Dimensions: Length overall / water x beam x draught
 700.00 ft / 700.00 ft x 90.00 ft x 26.50 ft (normal load)
 213.36 m / 213.36 m x 27.43 m  x 8.08 m

Armament:
      8 - 13.50" / 343 mm guns (2x4 guns), 1,230.19lbs / 558.00kg shells, 1915 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 1 raised mount
      12 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1915 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships
 Weight of broadside 11,138 lbs / 5,052 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 460.00 ft / 140.21 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 101 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 460.00 ft / 140.21 m 25.00 ft / 7.62 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: 2.00" / 51 mm       -         -

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

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 152,112 shp / 113,475 Kw = 32.00 kts
 Range 4,500nm at 15.00 kts
 Bunker at max displacement = 1,709 tons

Complement:
 1,030 - 1,340

Cost:
 £3.678 million / $14.711 million

Distribution of weights at normal displacement:
 Armament: 1,392 tons, 5.3 %
 Armour: 6,757 tons, 25.7 %
    - Belts: 2,001 tons, 7.6 %
    - Torpedo bulkhead: 851 tons, 3.2 %
    - Armament: 1,313 tons, 5.0 %
    - Armour Deck: 2,441 tons, 9.3 %
    - Conning Tower: 152 tons, 0.6 %
 Machinery: 3,639 tons, 13.9 %
 Hull, fittings & equipment: 12,483 tons, 47.6 %
 Fuel, ammunition & stores: 1,979 tons, 7.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   36,923 lbs / 16,748 Kg = 30.0 x 13.5 " / 343 mm shells or 5.1 torpedoes
 Stability (Unstable if below 1.00): 1.09
 Metacentric height 5.0 ft / 1.5 m
 Roll period: 16.9 seconds
 Steadiness - As gun platform (Average = 50 %): 55 %
   - Recoil effect (Restricted arc if above 1.00): 0.94
 Seaboat quality  (Average = 1.00): 1.10

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.550
 Length to Beam Ratio: 7.78 : 1
 'Natural speed' for length: 26.46 kts
 Power going to wave formation at top speed: 57 %
 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:  33.00 ft / 10.06 m
    - Forecastle (20 %): 29.00 ft / 8.84 m
    - Mid (67 %):  29.00 ft / 8.84 m (21.00 ft / 6.40 m aft of break)
    - Quarterdeck (15 %): 21.00 ft / 6.40 m
    - Stern:  21.00 ft / 6.40 m
    - Average freeboard: 26.68 ft / 8.13 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 108.7 %
  - Above water (accommodation/working, high = better): 217.8 %
 Waterplane Area: 43,980 Square feet or 4,086 Square metres
 Displacement factor (Displacement / loading): 104 %
 Structure weight / hull surface area: 190 lbs/sq ft or 925 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.82
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent