My Ger/BB/1918 battleship design (with 17in guns)

The next obvious move was to have a battleship analog to the 17in gunned battlecruiser. The Ger/BB/1918 is sort of a Mutsu/Nagato-style ship with 8-17in guns and 12-5.9in QF guns. The lower belt is about 14in with an 11in upper belt. The deck is 3.9in. That gives reasonable protection. I increased the beam to get better stability and ability to absorb gun recoil. The speed is 27 knots and the range is 5,200nm at 14 knots. The boilers are all coal-fired, as I would expect from the Germans in 1918. This is the Springsharp report:

Ger/BB/1918, Germany Battlecruiser laid down 1918 (Engine 1921)

Displacement:
 41,977 t light; 43,956 t standard; 46,300 t normal; 48,175 t full load

Dimensions: Length overall / water x beam x draught
 787.40 ft / 787.40 ft x 104.99 ft x 31.17 ft (normal load)
 240.00 m / 240.00 m x 32.00 m  x 9.50 m

Armament:
      8 - 16.93" / 430 mm guns (4x2 guns), 2,425.91lbs / 1,100.37kg shells, 1918 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      12 - 5.91" / 150 mm guns in single mounts, 102.98lbs / 46.71kg shells, 1918 Model
   Quick firing guns in casemate mounts 
   on side, all amidships
      8 - 3.46" / 88.0 mm guns in single mounts, 20.79lbs / 9.43kg shells, 1918 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships
 Weight of broadside 20,809 lbs / 9,439 kg
 Shells per gun, main battery: 90
 5 - 23.6" / 600 mm submerged torpedo tubes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 14.0" / 355 mm 524.93 ft / 160.00 m 9.84 ft / 3.00 m
 Ends: 5.91" / 150 mm 213.25 ft / 65.00 m 9.84 ft / 3.00 m
   49.21 ft / 15.00 m Unarmoured ends
 Upper: 11.0" / 280 mm 524.93 ft / 160.00 m 9.84 ft / 3.00 m
   Main Belt covers 103 % of normal length

   - Torpedo Bulkhead:
  3.15" / 80 mm 524.93 ft / 160.00 m 31.17 ft / 9.50 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 14.0" / 355 mm 7.09" / 180 mm  13.4" / 340 mm
 2nd: 5.91" / 150 mm 3.15" / 80 mm  3.15" / 80 mm

   - Armour deck: 3.94" / 100 mm, Conning tower: 13.98" / 355 mm

Machinery:
 Coal fired boilers, steam turbines, 
 Geared drive, 4 shafts, 109,296 shp / 81,535 Kw = 27.00 kts
 Range 5,200nm at 14.00 kts
 Bunker at max displacement = 4,219 tons (100% coal)

Complement:
 1,577 - 2,051

Cost:
 £8.468 million / $33.870 million

Distribution of weights at normal displacement:
 Armament: 2,601 tons, 5.6 %
 Armour: 16,982 tons, 36.7 %
    - Belts: 5,994 tons, 12.9 %
    - Torpedo bulkhead: 1,907 tons, 4.1 %
    - Armament: 4,170 tons, 9.0 %
    - Armour Deck: 4,524 tons, 9.8 %
    - Conning Tower: 388 tons, 0.8 %
 Machinery: 4,140 tons, 8.9 %
 Hull, fittings & equipment: 18,254 tons, 39.4 %
 Fuel, ammunition & stores: 4,323 tons, 9.3 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   62,455 lbs / 28,329 Kg = 25.7 x 16.9 " / 430 mm shells or 9.8 torpedoes
 Stability (Unstable if below 1.00): 1.06
 Metacentric height 6.0 ft / 1.8 m
 Roll period: 18.0 seconds
 Steadiness - As gun platform (Average = 50 %): 68 %
   - Recoil effect (Restricted arc if above 1.00): 0.91
 Seaboat quality  (Average = 1.00): 1.36

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.629
 Length to Beam Ratio: 7.50 : 1
 'Natural speed' for length: 28.06 kts
 Power going to wave formation at top speed: 48 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: -6.56 ft / -2.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  36.09 ft / 11.00 m
    - Forecastle (20 %): 29.53 ft / 9.00 m
    - Mid (50 %):  29.53 ft / 9.00 m (19.69 ft / 6.00 m aft of break)
    - Quarterdeck (15 %): 19.69 ft / 6.00 m
    - Stern:  19.69 ft / 6.00 m
    - Average freeboard: 25.13 ft / 7.66 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 90.7 %
  - Above water (accommodation/working, high = better): 181.8 %
 Waterplane Area: 62,111 Square feet or 5,770 Square metres
 Displacement factor (Displacement / loading): 100 %
 Structure weight / hull surface area: 209 lbs/sq ft or 1,022 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.27
  - 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