The GB/CL/1941, a 6in gun cruiser

The GB/CL/1941 design worked reasonably well in Springsharp, except that 35 knots was not readily achievable, at least with the specified power. The ship has a 3in armour basis and a 2in deck. The armament is 12-6in/45 QF, 8-4in AA, and 30-40mm AA guns. This is the original pencil drawing:

I have this near-fatal attraction to freehand, pencil drawings. There are tradeoffs, and the curve is due to the lense distortion, as the picture is off-center, due to trying to reduce flash glare. This is the Springsharp 3.0b1 Beta report:

GB/CL/1941, Great Britain Light Cruiser laid down 1941 (Engine 1945)

Displacement:
 10,440 t light; 10,805 t standard; 11,496 t normal; 12,048 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (646.22 ft / 640.00 ft) x 64.00 ft x (19.00 / 19.70 ft)
 (196.97 m / 195.07 m) x 19.51 m  x (5.79 / 6.00 m)

Armament:
      12 - 6.00" / 152 mm 45.0 cal guns - 108.92lbs / 49.41kg shells, 150 per gun
   Quick firing guns in turret on barbette mounts , 1941 Model
   4 x Triple mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
      8 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 150 per gun
   Anti-air guns in deck and hoist mounts , 1941 Model
   4 x Twin mounts on sides, forward deck aft
  4 raised mounts
      30 - 1.57" / 40.0 mm 45.0 cal guns - 2.00lbs / 0.91kg shells, 150 per gun
   Anti-air guns in deck mounts , 1941 Model
   4 x 2 row sextuple mounts on sides, evenly spread
  4 raised mounts
   1 x 2 row sextuple mount on centreline, aft deck aft
 Weight of broadside 1,625 lbs / 1,625 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 3.00" / 76 mm 425.00 ft / 129.54 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 102 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  0.75" / 19 mm 425.00 ft / 129.54 m 19.00 ft / 5.79 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 4.00" / 102 mm 2.00" / 51 mm  3.00" / 76 mm
 2nd: 1.00" / 25 mm 1.00" / 25 mm  1.00" / 25 mm
 3rd: 1.00" / 25 mm       -         -

   - Armour deck: 2.00" / 51 mm, Conning tower: 3.00" / 76 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 115,092 shp / 85,858 Kw = 34.00 kts
 Range 5,400nm at 15.00 kts
 Bunker at max displacement = 1,243 tons

Complement:
 554 - 721

Cost:
 £5.715 million / $22.860 million

Distribution of weights at normal displacement:
 Armament: 370 tons, 3.2 %
 Armour: 2,271 tons, 19.8 %
    - Belts: 635 tons, 5.5 %
    - Torpedo bulkhead: 224 tons, 1.9 %
    - Armament: 353 tons, 3.1 %
    - Armour Deck: 1,026 tons, 8.9 %
    - Conning Tower: 33 tons, 0.3 %
 Machinery: 2,906 tons, 25.3 %
 Hull, fittings & equipment: 5,082 tons, 44.2 %
 Fuel, ammunition & stores: 1,056 tons, 9.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   16,754 lbs / 7,600 Kg = 155.1 x 6.0 " / 152 mm shells or 2.3 torpedoes
 Stability (Unstable if below 1.00): 1.11
 Metacentric height 3.1 ft / 0.9 m
 Roll period: 15.3 seconds
 Steadiness - As gun platform (Average = 50 %): 65 %
   - Recoil effect (Restricted arc if above 1.00): 0.48
 Seaboat quality  (Average = 1.00): 1.31

Hull form characteristics:
 Hull has a flush deck,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.517 / 0.523
 Length to Beam Ratio: 10.00 : 1
 'Natural speed' for length: 25.30 kts
 Power going to wave formation at top speed: 57 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 8.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  30.00 ft / 9.14 m,  26.00 ft / 7.92 m
    - Forward deck: 30.00 %,  26.00 ft / 7.92 m,  23.00 ft / 7.01 m
    - Aft deck: 35.00 %,  23.00 ft / 7.01 m,  23.00 ft / 7.01 m
    - Quarter deck: 15.00 %,  23.00 ft / 7.01 m,  24.00 ft / 7.32 m
    - Average freeboard:  24.45 ft / 7.45 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 137.9 %
  - Above water (accommodation/working, high = better): 225.8 %
 Waterplane Area: 27,720 Square feet or 2,575 Square metres
 Displacement factor (Displacement / loading): 121 %
 Structure weight / hull surface area: 108 lbs/sq ft or 527 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.73
  - 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