The Ger/CB/1916 "cruiser killer"

This is a ship based on a minimal specification from the Red Book. I used some creative license to fill in the gaps. This is what is on the page:

Dimensions: 700ft x 90ft x26.5ft    Displacement: 24,180 tons
Hull depth: 42ft
Cm: 0.92  Cp: 0.55
C: 0.35 (hull weight factor)  
Hull weight (Ws): 9,270 tons        Ws=0.35 x 700 x 90 x 42ft
Machinery:        3,000 tons             Power: 120,000 SHP

I hypothesized an armament of 8-12in BLR and 16-4in QF guns. I adjusted the armour basis to fit the available displacement, using the "all or nothing" armouring scheme. The design has a 9in armour basis and a 3in deck. The torpedo bulkhead is 2in. That seems to give adequate protection. My design actually uses a greater hull depth than the original specification. This is the Springsharp report:

Ger/CB/1916, Germany Battlecruiser laid down 1916 (Engine 1939)

Displacement:
 23,007 t light; 23,897 t standard; 25,600 t normal; 26,962 t full load

Dimensions: Length overall / water x beam x draught
 702.17 ft / 700.00 ft x 90.00 ft x 26.50 ft (normal load)
 214.02 m / 213.36 m x 27.43 m  x 8.08 m

Armament:
      8 - 12.00" / 305 mm guns (4x2 guns), 864.00lbs / 391.90kg shells, 1916 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      16 - 4.00" / 102 mm guns (8x2 guns), 32.00lbs / 14.51kg shells, 1916 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships, 2 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: 9.00" / 229 mm 460.00 ft / 140.21 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 101 % of normal length

   - Torpedo Bulkhead:
  2.00" / 51 mm 460.00 ft / 140.21 m 26.00 ft / 7.92 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 9.00" / 229 mm 6.00" / 152 mm  9.00" / 229 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

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

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 120,035 shp / 89,546 Kw = 30.34 kts
 Range 8,000nm at 15.00 kts
 Bunker at max displacement = 3,065 tons

Complement:
 1,011 - 1,315

Cost:
 £3.337 million / $13.349 million

Distribution of weights at normal displacement:
 Armament: 928 tons, 3.6 %
 Armour: 8,360 tons, 32.7 %
    - Belts: 2,998 tons, 11.7 %
    - Torpedo bulkhead: 885 tons, 3.5 %
    - Armament: 1,898 tons, 7.4 %
    - Armour Deck: 2,410 tons, 9.4 %
    - Conning Tower: 168 tons, 0.7 %
 Machinery: 3,248 tons, 12.7 %
 Hull, fittings & equipment: 10,472 tons, 40.9 %
 Fuel, ammunition & stores: 2,593 tons, 10.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   43,059 lbs / 19,531 Kg = 49.8 x 12.0 " / 305 mm shells or 6.8 torpedoes
 Stability (Unstable if below 1.00): 1.11
 Metacentric height 5.2 ft / 1.6 m
 Roll period: 16.6 seconds
 Steadiness - As gun platform (Average = 50 %): 61 %
   - Recoil effect (Restricted arc if above 1.00): 0.60
 Seaboat quality  (Average = 1.00): 1.22

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.537
 Length to Beam Ratio: 7.78 : 1
 'Natural speed' for length: 26.46 kts
 Power going to wave formation at top speed: 54 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 4.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  31.00 ft / 9.45 m
    - Forecastle (20 %): 27.00 ft / 8.23 m
    - Mid (67 %):  27.00 ft / 8.23 m (19.00 ft / 5.79 m aft of break)
    - Quarterdeck (15 %): 19.00 ft / 5.79 m
    - Stern:  19.00 ft / 5.79 m
    - Average freeboard: 24.68 ft / 7.52 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 88.5 %
  - Above water (accommodation/working, high = better): 202.8 %
 Waterplane Area: 43,423 Square feet or 4,034 Square metres
 Displacement factor (Displacement / loading): 115 %
 Structure weight / hull surface area: 164 lbs/sq ft or 799 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.49
  - 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