The GB/CL/1914 design study

I have a sketch design from the early 1970's for a variant of the British C-class light cruisers. the side armour is very limited and of 2in thickness. The deck armour is 1in, but is a complete deck. the guns are 4-6in/50 QF guns and there are 8-21in TT. The look is very much like a C-class ship, except the speed is 32 knots. The idea was to get a higher speed in exchange for lighter protection. This is the Springsharp report:

GB/CL/1914, Great Britain Light Cruiser laid down 1914 (Engine 1943)

Displacement:
 3,820 t light; 3,950 t standard; 4,344 t normal; 4,658 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (456.47 ft / 450.00 ft) x 41.00 ft x (16.00 / 16.88 ft)
 (139.13 m / 137.16 m) x 12.50 m  x (4.88 / 5.15 m)

Armament:
      4 - 6.00" / 152 mm 50.0 cal guns - 100.00lbs / 45.36kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1914 Model
   3 x Single mounts on centreline ends, majority aft
   1 x Single mount on centreline, aft deck forward
  1 raised mount aft
      Weight of broadside 400 lbs / 181 kg
      8 - 21.0" / 533 mm, 20.00 ft / 6.10 m torpedoes - 1.279 t each, 10.231 t total
 In 4 sets of deck mounted side rotating tubes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 2.00" / 51 mm 305.00 ft / 92.96 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 2.00" / 51 mm 120.00 ft / 36.58 m 8.00 ft / 2.44 m
   Main Belt covers 104 % of normal length
   Main belt does not fully cover magazines and engineering spaces

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

   - Armoured deck - multiple decks: 1.00" / 25 mm For and Aft decks
 Forecastle: 1.00" / 25 mm  Quarter deck: 1.00" / 25 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 56,545 shp / 42,182 Kw = 32.00 kts
 Range 5,600nm at 15.00 kts
 Bunker at max displacement = 708 tons

Complement:
 266 - 347

Cost:
 £0.491 million / $1.966 million

Distribution of weights at normal displacement:
 Armament: 145 tons, 3.3 %
    - Guns: 135 tons, 3.1 %
    - Torpedoes: 10 tons, 0.2 %
 Armour: 622 tons, 14.3 %
    - Belts: 290 tons, 6.7 %
    - Armament: 99 tons, 2.3 %
    - Armour Deck: 232 tons, 5.4 %
 Machinery: 1,460 tons, 33.6 %
 Hull, fittings & equipment: 1,592 tons, 36.7 %
 Fuel, ammunition & stores: 524 tons, 12.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   3,656 lbs / 1,658 Kg = 33.8 x 6.0 " / 152 mm shells or 0.8 torpedoes
 Stability (Unstable if below 1.00): 1.08
 Metacentric height 1.5 ft / 0.5 m
 Roll period: 13.9 seconds
 Steadiness - As gun platform (Average = 50 %): 53 %
   - Recoil effect (Restricted arc if above 1.00): 0.37
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has rise forward of midbreak,
   an extended bulbous bow and a cruiser stern
 Block coefficient (normal/deep): 0.515 / 0.523
 Length to Beam Ratio: 10.98 : 1
 'Natural speed' for length: 21.21 kts
 Power going to wave formation at top speed: 62 %
 Trim (Max stability = 0, Max steadiness = 100): 52
 Bow angle (Positive = bow angles forward): 11.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 17.00 %,  23.00 ft / 7.01 m,  22.00 ft / 6.71 m
    - Forward deck: 16.00 %,  22.00 ft / 6.71 m,  22.00 ft / 6.71 m
    - Aft deck: 52.00 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
    - Quarter deck: 15.00 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
    - Average freeboard:  16.71 ft / 5.09 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 119.2 %
  - Above water (accommodation/working, high = better): 137.6 %
 Waterplane Area: 12,463 Square feet or 1,158 Square metres
 Displacement factor (Displacement / loading): 109 %
 Structure weight / hull surface area: 71 lbs/sq ft or 347 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.93
  - Longitudinal: 1.94
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent