It takes a big ship: the GB/BB/1905 Battleship-Cruiser

This is a design study for a 1905 British battleship-cruiser (or fast battleship). I had decided that I wanted an armament with 10-12in/45 and 12-6in QF guns with an armour basis of 11in. That, with a 25 knot speed means a larger ship. Still, the displacement is not too out of hand. As you would hope, this is a smaller ship than a Queen Elizabeth class ship from 1912. I am going with the anachronistic all oil fuel in 1905, so that is open for debate. Otherwise, the design is pretty straight forward, although it depends on lightweight machinery. This is the Springsharp report:

GB/BB/1905, Great Britain Battleship-Cruiser laid down 1905 (Engine 1909)

Displacement:
 22,961 t light; 24,321 t standard; 26,272 t normal; 27,832 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (641.00 ft / 634.00 ft) x 89.00 ft x (28.00 / 29.35 ft)
 (195.38 m / 193.24 m) x 27.13 m  x (8.53 / 8.94 m)

Armament:
      10 - 12.00" / 305 mm 45.0 cal guns - 871.37lbs / 395.24kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1905 Model
   4 x Twin mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
   1 x Twin mount on centreline, aft deck forward
      12 - 6.00" / 152 mm 45.0 cal guns - 108.92lbs / 49.41kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1905 Model
   8 x Single mounts on sides, forward deck aft
   4 x Single mounts on sides, aft evenly spread
      Weight of broadside 10,021 lbs / 4,545 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 11.0" / 279 mm 430.00 ft / 131.06 m 8.00 ft / 2.44 m
 Ends: 4.00" / 102 mm 200.00 ft / 60.96 m 12.00 ft / 3.66 m
   4.00 ft / 1.22 m Unarmoured ends
 Upper: 9.00" / 229 mm 430.00 ft / 131.06 m 8.00 ft / 2.44 m
   Main Belt covers 104 % of normal length

   - Torpedo Bulkhead:
  2.00" / 51 mm 390.00 ft / 118.87 m 28.00 ft / 8.53 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 11.0" / 279 mm 8.00" / 203 mm  11.0" / 279 mm
 2nd: 6.00" / 152 mm 5.00" / 127 mm  5.00" / 127 mm

   - Protected deck - multiple decks: 3.00" / 76 mm For and Aft decks
 Forecastle: 3.00" / 76 mm  Quarter deck: 3.00" / 76 mm

   - Conning towers: Forward 11.00" / 279 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 60,472 shp / 45,112 Kw = 25.00 kts
 Range 5,600nm at 14.00 kts
 Bunker at max displacement = 3,511 tons

Complement:
 1,031 - 1,341

Cost:
 £2.064 million / $8.254 million

Distribution of weights at normal displacement:
 Armament: 1,771 tons, 6.7 %
 Armour: 9,297 tons, 35.4 %
    - Belts: 3,283 tons, 12.5 %
    - Torpedo bulkhead: 808 tons, 3.1 %
    - Armament: 2,726 tons, 10.4 %
    - Armour Deck: 2,270 tons, 8.6 %
    - Conning Tower: 209 tons, 0.8 %
 Machinery: 2,749 tons, 10.5 %
 Hull, fittings & equipment: 9,144 tons, 34.8 %
 Fuel, ammunition & stores: 3,311 tons, 12.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   41,765 lbs / 18,944 Kg = 48.3 x 12.0 " / 305 mm shells or 6.8 torpedoes
 Stability (Unstable if below 1.00): 1.10
 Metacentric height 5.0 ft / 1.5 m
 Roll period: 16.6 seconds
 Steadiness - As gun platform (Average = 50 %): 76 %
   - Recoil effect (Restricted arc if above 1.00): 0.79
 Seaboat quality  (Average = 1.00): 1.52

Hull form characteristics:
 Hull has rise forward of midbreak,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.582 / 0.588
 Length to Beam Ratio: 7.12 : 1
 'Natural speed' for length: 25.18 kts
 Power going to wave formation at top speed: 49 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -3.00 degrees
 Stern overhang: -3.00 ft / -0.91 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 25.00 %,  29.00 ft / 8.84 m,  29.00 ft / 8.84 m
    - Forward deck: 12.00 %,  29.00 ft / 8.84 m,  29.00 ft / 8.84 m
    - Aft deck: 48.00 %,  21.00 ft / 6.40 m,  21.00 ft / 6.40 m
    - Quarter deck: 15.00 %,  21.00 ft / 6.40 m,  21.00 ft / 6.40 m
    - Average freeboard:  23.96 ft / 7.30 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 85.0 %
  - Above water (accommodation/working, high = better): 169.4 %
 Waterplane Area: 40,579 Square feet or 3,770 Square metres
 Displacement factor (Displacement / loading): 114 %
 Structure weight / hull surface area: 165 lbs/sq ft or 806 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.64
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 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