My modified Colony class design

As long ago as 1968 (I was making a model out of index paper, watching TV when Bobby Kennedy was assassinated by a Palestinian terrorist), I had this concept for a Colony class-like cruiser that had inclined side armour. This is an attempt at such a ship in Springsharp 3.0b2 Beta. The displacement is a bit high, but otherwise, the design seems reasonable. The SHP required for 31.5 knots is about what we would expect. My ship has 12-6in QF guns (rather than the original BLR), 8-4in AA guns, and 12-2pdr AA guns. There are also 6-21in TT in triple mounts. The armour basis is 3.5in with a 2in protective deck. This is the Springsharp report:

GB/CL/1941, Great Britain Light Cruiser laid down 1941

Displacement:
 8,402 t light; 8,737 t standard; 9,443 t normal; 10,008 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (557.94 ft / 555.00 ft) x 62.00 ft x (17.00 / 17.81 ft)
 (170.06 m / 169.16 m) x 18.90 m  x (5.18 / 5.43 m)

Armament:
      12 - 6.00" / 152 mm 50.0 cal guns - 114.33lbs / 51.86kg shells, 150 per gun
   Quick firing guns in turret on barbette mounts, 1941 Model
   4 x Triple mounts on centreline ends, evenly spread
      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 2-gun mounts on sides, aft deck forward
  4 raised mounts
      12 - 1.57" / 40.0 mm 50.0 cal guns - 2.00lbs / 0.91kg shells, 150 per gun
   Anti-air guns in deck mounts, 1941 Model
   2 x 2 row quad mounts on sides amidships
  2 raised mounts
   1 x Single mount on centreline, aft deck forward
      Weight of broadside 1,654 lbs / 750 kg
      6 - 21.0" / 533 mm, 20.00 ft / 6.10 m torpedoes - 1.387 t each, 8.321 t total
 In 2 sets of deck mounted carriage/fixed tubes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 3.50" / 89 mm 370.00 ft / 112.78 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 3.50" / 89 mm 210.00 ft / 64.01 m 8.00 ft / 2.44 m
   Main Belt covers 103 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 370.00 ft / 112.78 m 16.50 ft / 5.03 m

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

   - Protected deck - single deck: 2.00" / 51 mm For and Aft decks

   - Conning towers: Forward 4.00" / 102 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 82,961 shp / 61,889 Kw = 31.50 kts
 Range 10,000nm at 12.00 kts
 Bunker at max displacement = 1,270 tons

Complement:
 478 - 622

Cost:
 £4.771 million / $19.084 million

Distribution of weights at normal displacement:
 Armament: 434 tons, 4.6 %
    - Guns: 426 tons, 4.5 %
    - Torpedoes: 8 tons, 0.1 %
 Armour: 1,897 tons, 20.1 %
    - Belts: 703 tons, 7.4 %
    - Torpedo bulkhead: 226 tons, 2.4 %
    - Armament: 402 tons, 4.3 %
    - Armour Deck: 528 tons, 5.6 %
    - Conning Tower: 39 tons, 0.4 %
 Machinery: 2,192 tons, 23.2 %
 Hull, fittings & equipment: 3,879 tons, 41.1 %
 Fuel, ammunition & stores: 1,041 tons, 11.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   15,213 lbs / 6,900 Kg = 140.9 x 6.0 " / 152 mm shells or 2.2 torpedoes
 Stability (Unstable if below 1.00): 1.16
 Metacentric height 3.2 ft / 1.0 m
 Roll period: 14.5 seconds
 Steadiness - As gun platform (Average = 50 %): 54 %
   - Recoil effect (Restricted arc if above 1.00): 0.45
 Seaboat quality  (Average = 1.00): 1.07

Hull form characteristics:
 Hull has low quarterdeck ,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.565 / 0.572
 Length to Beam Ratio: 8.95 : 1
 'Natural speed' for length: 23.56 kts
 Power going to wave formation at top speed: 60 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 6.00 degrees
 Stern overhang: -3.00 ft / -0.91 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 28.00 %,  28.00 ft / 8.53 m,  24.00 ft / 7.32 m
    - Forward deck: 30.00 %,  24.00 ft / 7.32 m,  24.00 ft / 7.32 m
    - Aft deck: 9.00 %,  24.00 ft / 7.32 m,  24.00 ft / 7.32 m
    - Quarter deck: 33.00 %,  16.00 ft / 4.88 m,  18.00 ft / 5.49 m
    - Average freeboard:  22.14 ft / 6.75 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 136.5 %
  - Above water (accommodation/working, high = better): 230.9 %
 Waterplane Area: 24,355 Square feet or 2,263 Square metres
 Displacement factor (Displacement / loading): 119 %
 Structure weight / hull surface area: 107 lbs/sq ft or 521 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.67
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent