My anachronistic Repulse design

Today, I thought that I would try an anachronistic Repulse design, somewhat along the lines of what I had drawn almost 20 years ago. My pencil drawing from tonight is not as polished as what I had done in the past, sadly. My main tweaks are a flush-decked hull and two triple 15in turrets forward. The side armour is 6in, with 4in at the ends. The deck is 3in with a 1.5in torpedo bulkhead. The maximum on the turrets and barbettes is 8in. I settled for a speed of 31 knots. The design works reasonably well, except that the displacement needed to be substantially more to achieve adequate strength, while keeping the draft at just 27ft. This is the Springsharp 3.0b1 Beta report:

Repulse, anachronistic, Great Britain Battlecruiser laid down 1914 (Engine 1917)

Displacement:
 28,106 t light; 29,355 t standard; 31,201 t normal; 32,678 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (800.23 ft / 794.00 ft) x 90.00 ft x (27.00 / 28.02 ft)
 (243.91 m / 242.01 m) x 27.43 m  x (8.23 / 8.54 m)

Armament:
      6 - 15.00" / 381 mm 42.0 cal guns - 1,940.00lbs / 879.97kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts , 1914 Model
   2 x Triple mounts on centreline, forward evenly spread
  1 raised mount
      16 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts , 1914 Model
   8 x Twin mounts on sides, forward deck aft
  8 raised mounts
 Weight of broadside 12,156 lbs / 12,156 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 425.00 ft / 129.54 m 16.00 ft / 4.88 m
 Ends: 4.00" / 102 mm 320.00 ft / 97.54 m 16.00 ft / 4.88 m
   49.00 ft / 14.94 m Unarmoured ends
   Main Belt covers 82 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 425.00 ft / 129.54 m 27.00 ft / 8.23 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 6.00" / 152 mm  8.00" / 203 mm
 2nd: 4.00" / 102 mm 2.00" / 51 mm  4.00" / 102 mm

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

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 140,589 shp / 104,879 Kw = 31.00 kts
 Range 5,600nm at 15.00 kts
 Bunker at max displacement = 3,323 tons

Complement:
 1,173 - 1,525

Cost:
 £3.321 million / $13.285 million

Distribution of weights at normal displacement:
 Armament: 1,635 tons, 5.2 %
 Armour: 7,824 tons, 25.1 %
    - Belts: 2,542 tons, 8.1 %
    - Torpedo bulkhead: 849 tons, 2.7 %
    - Armament: 1,453 tons, 4.7 %
    - Armour Deck: 2,810 tons, 9.0 %
    - Conning Tower: 171 tons, 0.5 %
 Machinery: 5,154 tons, 16.5 %
 Hull, fittings & equipment: 14,052 tons, 45.0 %
 Fuel, ammunition & stores: 3,095 tons, 9.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   43,986 lbs / 19,952 Kg = 26.1 x 15.0 " / 381 mm shells or 5.8 torpedoes
 Stability (Unstable if below 1.00): 1.13
 Metacentric height 5.3 ft / 1.6 m
 Roll period: 16.4 seconds
 Steadiness - As gun platform (Average = 50 %): 64 %
   - Recoil effect (Restricted arc if above 1.00): 0.96
 Seaboat quality  (Average = 1.00): 1.28

Hull form characteristics:
 Hull has a flush deck,
   a normal bow and a round stern
 Block coefficient (normal/deep): 0.566 / 0.571
 Length to Beam Ratio: 8.82 : 1
 'Natural speed' for length: 28.18 kts
 Power going to wave formation at top speed: 51 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 9.00 degrees
 Stern overhang: 1.00 ft / 0.30 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  33.00 ft / 10.06 m,  27.00 ft / 8.23 m
    - Forward deck: 30.00 %,  27.00 ft / 8.23 m,  24.00 ft / 7.32 m
    - Aft deck: 35.00 %,  24.00 ft / 7.32 m,  24.00 ft / 7.32 m
    - Quarter deck: 15.00 %,  24.00 ft / 7.32 m,  26.00 ft / 7.92 m
    - Average freeboard:  25.68 ft / 7.83 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 103.5 %
  - Above water (accommodation/working, high = better): 203.0 %
 Waterplane Area: 50,626 Square feet or 4,703 Square metres
 Displacement factor (Displacement / loading): 117 %
 Structure weight / hull surface area: 187 lbs/sq ft or 913 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.37
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily