The anachronistic "Invincible" class

My anachronistic "Invincible" class design has a flush deck, three turrets (two triple and one twin 12in) and 8 twin mounts with 4in QF guns. The armour basis is 6in with a 2in deck and torpedo bulkhead. There are three, closely spaced funnels with a late-model bridge, with tripod foremast and control top. The mainmast is a pole, equipped with a derrick and light topmast, with yards. The conningtower has a small range finder and controller, with a secondary conning tower aft. The design uses "all-or-nothing" principles. This is the Springsharp report:

Invincible (anachronistic), Great Britain Battlecruiser laid down 1912 (Engine 1908)

Displacement:
 15,267 t light; 16,000 t standard; 17,800 t normal; 19,240 t full load

Dimensions: Length overall / water x beam x draught
 565.00 ft / 565.00 ft x 78.00 ft x 25.00 ft (normal load)
 172.21 m / 172.21 m x 23.77 m  x 7.62 m

Armament:
      8 - 12.00" / 305 mm guns (3 mounts), 864.00lbs / 391.90kg shells, 1912 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      16 - 4.00" / 102 mm guns (8x2 guns), 32.00lbs / 14.51kg shells, 1912 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
 Weight of broadside 7,424 lbs / 3,367 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 365.00 ft / 111.25 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 99 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 365.00 ft / 111.25 m 25.00 ft / 7.62 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 2.00" / 51 mm  3.00" / 76 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 4 shafts, 49,083 shp / 36,616 Kw = 25.00 kts
 Range 4,500nm at 14.00 kts
 Bunker at max displacement = 3,240 tons (100% coal)

Complement:
 769 - 1,001

Cost:
 £1.696 million / $6.782 million

Distribution of weights at normal displacement:
 Armament: 928 tons, 5.2 %
 Armour: 4,534 tons, 25.5 %
    - Belts: 1,511 tons, 8.5 %
    - Torpedo bulkhead: 675 tons, 3.8 %
    - Armament: 1,104 tons, 6.2 %
    - Armour Deck: 1,155 tons, 6.5 %
    - Conning Tower: 88 tons, 0.5 %
 Machinery: 2,727 tons, 15.3 %
 Hull, fittings & equipment: 7,078 tons, 39.8 %
 Fuel, ammunition & stores: 2,533 tons, 14.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   21,409 lbs / 9,711 Kg = 24.8 x 12.0 " / 305 mm shells or 3.3 torpedoes
 Stability (Unstable if below 1.00): 1.14
 Metacentric height 4.4 ft / 1.3 m
 Roll period: 15.6 seconds
 Steadiness - As gun platform (Average = 50 %): 65 %
   - Recoil effect (Restricted arc if above 1.00): 0.81
 Seaboat quality  (Average = 1.00): 1.30

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.565
 Length to Beam Ratio: 7.24 : 1
 'Natural speed' for length: 23.77 kts
 Power going to wave formation at top speed: 51 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: -1.00 ft / -0.30 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  23.00 ft / 7.01 m
    - Forecastle (20 %): 20.00 ft / 6.10 m
    - Mid (50 %):  20.00 ft / 6.10 m
    - Quarterdeck (15 %): 20.00 ft / 6.10 m
    - Stern:  20.00 ft / 6.10 m
    - Average freeboard: 20.24 ft / 6.17 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 119.4 %
  - Above water (accommodation/working, high = better): 154.6 %
 Waterplane Area: 31,205 Square feet or 2,899 Square metres
 Displacement factor (Displacement / loading): 102 %
 Structure weight / hull surface area: 154 lbs/sq ft or 751 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.64
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily