The "38 knot battlecruiser" (actually, 35-knot)

I just do a new design for what I had optimistically hoped was a 38-knot battlecruiser in 1971. The designed power was 180,000 SHP with a normal displacement of 29,000 tons. The armament was listed as 4-13.5in guns, although I added a nominal secondary armament of 12-4in QF guns, when I entered the design in Springsharp. Amazingly enough, it works pretty well, if you settle for "only" 35 knots:

38 knot battlecruiser, Great Britain Battlecruiser laid down 1915 (Engine 1927)

Displacement:
 26,527 t light; 27,354 t standard; 29,350 t normal; 30,947 t full load

Dimensions: Length overall / water x beam x draught
 851.19 ft / 850.00 ft x 95.00 ft x 34.00 ft (normal load)
 259.44 m / 259.08 m x 28.96 m  x 10.36 m

Armament:
      4 - 13.50" / 343 mm guns (2x2 guns), 1,230.19lbs / 558.00kg shells, 1915 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread
      12 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1915 Model
   Quick firing guns in deck mounts with hoists
   on side, all forward
 Weight of broadside 5,305 lbs / 2,406 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 480.00 ft / 146.30 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 87 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 480.00 ft / 146.30 m 29.00 ft / 8.84 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, 195,738 shp / 146,020 Kw = 35.00 kts
 Range 7,500nm at 15.00 kts
 Bunker at max displacement = 3,593 tons

Complement:
 1,120 - 1,457

Cost:
 £3.419 million / $13.675 million

Distribution of weights at normal displacement:
 Armament: 663 tons, 2.3 %
 Armour: 6,934 tons, 23.6 %
    - Belts: 2,091 tons, 7.1 %
    - Torpedo bulkhead: 1,030 tons, 3.5 %
    - Armament: 922 tons, 3.1 %
    - Armour Deck: 2,727 tons, 9.3 %
    - Conning Tower: 164 tons, 0.6 %
 Machinery: 6,179 tons, 21.1 %
 Hull, fittings & equipment: 12,751 tons, 43.4 %
 Fuel, ammunition & stores: 2,823 tons, 9.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   44,569 lbs / 20,216 Kg = 36.2 x 13.5 " / 343 mm shells or 5.7 torpedoes
 Stability (Unstable if below 1.00): 1.21
 Metacentric height 6.6 ft / 2.0 m
 Roll period: 15.5 seconds
 Steadiness - As gun platform (Average = 50 %): 82 %
   - Recoil effect (Restricted arc if above 1.00): 0.38
 Seaboat quality  (Average = 1.00): 1.64

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.374
 Length to Beam Ratio: 8.95 : 1
 'Natural speed' for length: 29.15 kts
 Power going to wave formation at top speed: 48 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 2.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  34.00 ft / 10.36 m
    - Forecastle (20 %): 31.00 ft / 9.45 m
    - Mid (67 %):  31.00 ft / 9.45 m (22.00 ft / 6.71 m aft of break)
    - Quarterdeck (15 %): 22.00 ft / 6.71 m
    - Stern:  22.00 ft / 6.71 m
    - Average freeboard: 28.27 ft / 8.62 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 108.4 %
  - Above water (accommodation/working, high = better): 238.2 %
 Waterplane Area: 49,139 Square feet or 4,565 Square metres
 Displacement factor (Displacement / loading): 119 %
 Structure weight / hull surface area: 162 lbs/sq ft or 790 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.77
  - 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