The Ger/BB/1915 CDV design study had to grow

When I tried calculating the Ger/BB/1915 CDV design study in Springsharp, I found that my original estimate for displacement was too low by a large margin. I had a standard displacment of only 25,000 tons, and the final design had to be 35,000 tons normal displacement. The ship was part of a fascination that we had in the early 1970's with the coast defense and 2nd and 3rd Class battleships from the latter 19th and early 20th century. This one is extreme, as it has 4-18in (180 ton) guns in twin turrets. The secondary armament is 16-4in QF guns in twin mounts. This is the Springsharp report:

Ger/BB/1915 CDV design study, Germany Coast Defense Battleship laid down 1915 (Engine 1937)

Displacement:
 32,554 t light; 34,279 t standard; 35,000 t normal; 35,577 t full load

Dimensions: Length overall / water x beam x draught
 650.42 ft / 650.00 ft x 118.00 ft x 25.00 ft (normal load)
 198.25 m / 198.12 m x 35.97 m  x 7.62 m

Armament:
      4 - 18.00" / 457 mm guns in single mounts, 2,916.00lbs / 1,322.68kg shells, 1915 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread
      16 - 4.00" / 102 mm guns (8x2 guns), 32.00lbs / 14.51kg shells, 1915 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships
 Weight of broadside 12,176 lbs / 5,523 kg
 Shells per gun, main battery: 150
 4 - 23.6" / 599.44 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 10.0" / 254 mm 375.00 ft / 114.30 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 89 % of normal length

   - Torpedo Bulkhead:
  2.00" / 51 mm 375.00 ft / 114.30 m 24.00 ft / 7.32 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 10.0" / 254 mm 10.0" / 254 mm  10.0" / 254 mm

   - Armour deck: 10.00" / 254 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 90,473 shp / 67,493 Kw = 26.00 kts
 Range 3,600nm at 12.00 kts
 Bunker at max displacement = 1,298 tons

Complement:
 1,279 - 1,663

Cost:
 £4.028 million / $16.110 million

Distribution of weights at normal displacement:
 Armament: 1,522 tons, 4.3 %
 Armour: 16,050 tons, 45.9 %
    - Belts: 2,940 tons, 8.4 %
    - Torpedo bulkhead: 666 tons, 1.9 %
    - Armament: 1,685 tons, 4.8 %
    - Armour Deck: 10,759 tons, 30.7 %
    - Conning Tower: 0 tons, 0.0 %
 Machinery: 2,508 tons, 7.2 %
 Hull, fittings & equipment: 12,474 tons, 35.6 %
 Fuel, ammunition & stores: 2,446 tons, 7.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   70,111 lbs / 31,802 Kg = 24.0 x 18.0 " / 457 mm shells or 13.0 torpedoes
 Stability (Unstable if below 1.00): 1.41
 Metacentric height 11.6 ft / 3.5 m
 Roll period: 14.5 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.21
 Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.639
 Length to Beam Ratio: 5.51 : 1
 'Natural speed' for length: 25.50 kts
 Power going to wave formation at top speed: 54 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 1.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  24.00 ft / 7.32 m
    - Forecastle (20 %): 20.00 ft / 6.10 m
    - Mid (50 %):  20.00 ft / 6.10 m
    - Quarterdeck (15 %): 20.00 ft / 6.10 m
    - Stern:  20.00 ft / 6.10 m
    - Average freeboard: 20.32 ft / 6.19 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 69.5 %
  - Above water (accommodation/working, high = better): 165.4 %
 Waterplane Area: 58,158 Square feet or 5,403 Square metres
 Displacement factor (Displacement / loading): 105 %
 Structure weight / hull surface area: 173 lbs/sq ft or 846 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.98
  - Longitudinal: 1.31
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent