My anachronistic version of the Devastation

I have been contemplating an anachronistic Devastation design. I finally made the design today, and was amazed at how well the Devastation worked. The anachronistic ship has 4-10in guns and a speed of 19 knots. The range is 4,450nm at an amazing 15 knots. This is the Springsharp report:

Devastation, anachronistic, Great Britain Battleship laid down 1908

Displacement:
 7,579 t light; 7,866 t standard; 9,330 t normal; 10,501 t full load

Dimensions: Length overall / water x beam x draught
 310.05 ft / 307.00 ft x 62.00 ft x 26.67 ft (normal load)
 94.50 m / 93.57 m x 18.90 m  x 8.13 m

Armament:
      4 - 10.00" / 254 mm guns (2x2 guns), 500.00lbs / 226.80kg shells, 1908 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread
 Weight of broadside 2,000 lbs / 907 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 190.00 ft / 57.91 m 12.00 ft / 3.66 m
 Ends: 8.50" / 216 mm 117.00 ft / 35.66 m 12.00 ft / 3.66 m
   Main Belt covers 95 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 190.00 ft / 57.91 m 26.67 ft / 8.13 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 12.0" / 305 mm 10.0" / 254 mm  12.0" / 305 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 9.00" / 229 mm

Machinery:
 Coal fired boilers, complex reciprocating steam engines, 
 Direct drive, 2 shafts, 15,113 ihp / 11,274 Kw = 19.00 kts
 Range 4,450nm at 15.00 kts
 Bunker at max displacement = 2,636 tons (100% coal)

Complement:
 474 - 617

Cost:
 £0.668 million / $2.670 million

Distribution of weights at normal displacement:
 Armament: 250 tons, 2.7 %
 Armour: 3,516 tons, 37.7 %
    - Belts: 1,698 tons, 18.2 %
    - Torpedo bulkhead: 187 tons, 2.0 %
    - Armament: 740 tons, 7.9 %
    - Armour Deck: 804 tons, 8.6 %
    - Conning Tower: 86 tons, 0.9 %
 Machinery: 1,374 tons, 14.7 %
 Hull, fittings & equipment: 2,440 tons, 26.1 %
 Fuel, ammunition & stores: 1,751 tons, 18.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   12,415 lbs / 5,631 Kg = 24.8 x 10.0 " / 254 mm shells or 2.6 torpedoes
 Stability (Unstable if below 1.00): 1.08
 Metacentric height 2.8 ft / 0.9 m
 Roll period: 15.4 seconds
 Steadiness - As gun platform (Average = 50 %): 53 %
   - Recoil effect (Restricted arc if above 1.00): 0.40
 Seaboat quality  (Average = 1.00): 1.06

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.643
 Length to Beam Ratio: 4.95 : 1
 'Natural speed' for length: 17.52 kts
 Power going to wave formation at top speed: 61 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  20.00 ft / 6.10 m
    - Forecastle (20 %): 17.00 ft / 5.18 m
    - Mid (50 %):  17.00 ft / 5.18 m
    - Quarterdeck (15 %): 17.00 ft / 5.18 m
    - Stern:  17.00 ft / 5.18 m
    - Average freeboard: 17.24 ft / 5.25 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 101.1 %
  - Above water (accommodation/working, high = better): 99.0 %
 Waterplane Area: 14,491 Square feet or 1,346 Square metres
 Displacement factor (Displacement / loading): 113 %
 Structure weight / hull surface area: 107 lbs/sq ft or 521 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.87
  - Longitudinal: 3.35
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is adequate