My attempt at the Seydlitz upgunned with 6-17in guns

I tried designing the battlecruiser Seydlitz, modified to have 6-17in guns, with one twin turret on the forecastle and two turrets aft, one in the superfiring position. The old turrets and barbettes in echelon are removed. The speed is 27 knots. The Seydlitz would outgun the Renown and Repulse, although the Seydlitz would be slower. The Seydlitz is much better protected, however. This is the Springsharp report:

Seydlitz, upgunned, Germany Battlecruiser laid down 1914 (Engine 1911)

Displacement:
 27,774 t light; 29,235 t standard; 31,300 t normal; 32,952 t full load

Dimensions: Length overall / water x beam x draught
 664.70 ft / 658.14 ft x 93.50 ft (Bulges 98.43 ft) x 30.51 ft (normal load)
 202.60 m / 200.60 m x 28.50 m (Bulges 30.00 m)  x 9.30 m

Armament:
      2 - 16.93" / 430 mm guns (1x2 guns), 2,425.91lbs / 1,100.37kg shells, 1914 Model
   Breech loading guns in a turret (on a barbette)
   on centreline forward
      4 - 16.93" / 430 mm guns (2x2 guns), 2,425.91lbs / 1,100.37kg shells, 1914 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all aft, 1 raised mount - superfiring
      12 - 5.91" / 150 mm guns in single mounts, 102.98lbs / 46.71kg shells, 1914 Model
   Quick firing guns in casemate mounts 
   on side, evenly spread
   12 guns in hull casemates - Limited use in heavy seas
      4 - 3.46" / 88.0 mm guns in single mounts, 20.79lbs / 9.43kg shells, 1914 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread, all raised mounts
 Weight of broadside 15,874 lbs / 7,200 kg
 Shells per gun, main battery: 90
 4 - 19.7" / 500 mm submerged torpedo tubes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 11.8" / 300 mm 393.70 ft / 120.00 m 9.84 ft / 3.00 m
 Ends: 3.94" / 100 mm 246.06 ft / 75.00 m 9.84 ft / 3.00 m
   18.37 ft / 5.60 m Unarmoured ends
 Upper: 5.91" / 150 mm 393.70 ft / 120.00 m 9.84 ft / 3.00 m
   Main Belt covers 92 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead and Bulges:
  1.77" / 45 mm 393.70 ft / 120.00 m 30.51 ft / 9.30 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 9.84" / 250 mm 3.15" / 80 mm  9.84" / 250 mm
 2nd: 9.84" / 250 mm 3.15" / 80 mm  9.84" / 250 mm
 3rd: 3.94" / 100 mm 1.18" / 30 mm  1.18" / 30 mm

   - Armour deck: 3.15" / 80 mm, Conning tower: 11.81" / 300 mm

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 4 shafts, 89,580 shp / 66,827 Kw = 27.00 kts
 Range 4,200nm at 14.00 kts
 Bunker at max displacement = 3,718 tons (100% coal)

Complement:
 1,176 - 1,529

Cost:
 £4.071 million / $16.285 million

Distribution of weights at normal displacement:
 Armament: 1,984 tons, 6.3 %
 Armour: 8,624 tons, 27.6 %
    - Belts: 3,371 tons, 10.8 %
    - Torpedo bulkhead: 787 tons, 2.5 %
    - Armament: 1,700 tons, 5.4 %
    - Armour Deck: 2,512 tons, 8.0 %
    - Conning Tower: 253 tons, 0.8 %
 Machinery: 3,999 tons, 12.8 %
 Hull, fittings & equipment: 13,168 tons, 42.1 %
 Fuel, ammunition & stores: 3,526 tons, 11.3 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   33,397 lbs / 15,148 Kg = 13.8 x 16.9 " / 430 mm shells or 4.7 torpedoes
 Stability (Unstable if below 1.00): 1.13
 Metacentric height 5.7 ft / 1.7 m
 Roll period: 17.4 seconds
 Steadiness - As gun platform (Average = 50 %): 68 %
   - Recoil effect (Restricted arc if above 1.00): 0.73
 Seaboat quality  (Average = 1.00): 1.35

Hull form characteristics:
 Hull has raised forecastle, rise forward of midbreak
 Block coefficient: 0.554
 Length to Beam Ratio: 6.69 : 1
 'Natural speed' for length: 25.65 kts
 Power going to wave formation at top speed: 52 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -2.00 degrees
 Stern overhang: 6.56 ft / 2.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  34.45 ft / 10.50 m
    - Forecastle (34 %): 34.45 ft / 10.50 m (24.61 ft / 7.50 m aft of break)
    - Mid (67 %):  24.61 ft / 7.50 m (14.76 ft / 4.50 m aft of break)
    - Quarterdeck (15 %): 14.76 ft / 4.50 m
    - Stern:  14.76 ft / 4.50 m
    - Average freeboard: 24.70 ft / 7.53 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 115.9 %
  - Above water (accommodation/working, high = better): 147.6 %
 Waterplane Area: 43,119 Square feet or 4,006 Square metres
 Displacement factor (Displacement / loading): 96 %
 Structure weight / hull surface area: 202 lbs/sq ft or 989 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.93
  - Longitudinal: 2.00
  - 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