I had to increase the displacement for the Ger/CL/1916 design

I was struggling to achieve adequate strength in the Ger/CL/1916 design. I had to increase the hull depth and the displacement. I was able to achieve the machinery power and close to the weight. The protection weight was also what was desired. The armament is 6-6in guns and 4-23.6in TT. The belt is actually 4in and the deck is 2in. Altogether, the ship is very well protected. This is the Springsharp report:

Ger/CL/1916, Germany Light Cruiser laid down 1916 (Engine 1941)

Displacement:
 5,921 t light; 6,052 t standard; 6,550 t normal; 6,949 t full load

Dimensions: Length overall / water x beam x draught
 478.96 ft / 475.00 ft x 48.00 ft x 18.00 ft (normal load)
 145.99 m / 144.78 m x 14.63 m  x 5.49 m

Armament:
      6 - 6.00" / 152 mm guns (3x2 guns), 108.00lbs / 48.99kg shells, 1916 Model
   Quick firing guns in deck mounts with hoists
   on centreline ends, majority aft, 1 raised mount aft - superfiring
 Weight of broadside 648 lbs / 294 kg
 Shells per gun, main battery: 0
 4 - 23.6" / 600.0001 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 350.00 ft / 106.68 m 12.00 ft / 3.66 m
 Ends: 2.00" / 51 mm 125.00 ft / 38.10 m 12.00 ft / 3.66 m
   Main Belt covers 113 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 350.00 ft / 106.68 m 16.00 ft / 4.88 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 5.00" / 127 mm 5.00" / 127 mm  5.00" / 127 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 5.00" / 127 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 60,562 shp / 45,179 Kw = 30.50 kts
 Range 5,400nm at 15.00 kts
 Bunker at max displacement = 897 tons

Complement:
 363 - 473

Cost:
 £0.817 million / $3.268 million

Distribution of weights at normal displacement:
 Armament: 81 tons, 1.2 %
 Armour: 1,774 tons, 27.1 %
    - Belts: 800 tons, 12.2 %
    - Torpedo bulkhead: 207 tons, 3.2 %
    - Armament: 136 tons, 2.1 %
    - Armour Deck: 594 tons, 9.1 %
    - Conning Tower: 38 tons, 0.6 %
 Machinery: 1,600 tons, 24.4 %
 Hull, fittings & equipment: 2,465 tons, 37.6 %
 Fuel, ammunition & stores: 629 tons, 9.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   9,263 lbs / 4,202 Kg = 85.8 x 6.0 " / 152 mm shells or 1.6 torpedoes
 Stability (Unstable if below 1.00): 1.13
 Metacentric height 2.1 ft / 0.6 m
 Roll period: 14.0 seconds
 Steadiness - As gun platform (Average = 50 %): 64 %
   - Recoil effect (Restricted arc if above 1.00): 0.41
 Seaboat quality  (Average = 1.00): 1.28

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.559
 Length to Beam Ratio: 9.90 : 1
 'Natural speed' for length: 21.79 kts
 Power going to wave formation at top speed: 61 %
 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:  28.00 ft / 8.53 m
    - Forecastle (20 %): 26.00 ft / 7.92 m
    - Mid (32 %):  26.00 ft / 7.92 m (18.00 ft / 5.49 m aft of break)
    - Quarterdeck (15 %): 18.00 ft / 5.49 m
    - Stern:  18.00 ft / 5.49 m
    - Average freeboard: 20.72 ft / 6.32 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 151.8 %
  - Above water (accommodation/working, high = better): 138.9 %
 Waterplane Area: 16,041 Square feet or 1,490 Square metres
 Displacement factor (Displacement / loading): 116 %
 Structure weight / hull surface area: 80 lbs/sq ft or 392 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.90
  - Longitudinal: 2.43
  - 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