My anachronistic version of the screw frigate Ariadne

This is based on my design for an anachronistic version of the British screw frigate Ariadne. I drew a pencil drawing and wrote down some specifications in the latter 1980's (I think). I went ahead and took advantage of the capacity in the design to better than I had thought at the time. This is the Springsharp report:

Ariadne, anachronistic, Great Britain Cruiser laid down 1907 (Engine 1909)

Displacement:
 3,372 t light; 3,561 t standard; 4,427 t normal; 5,120 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (290.00 ft / 290.00 ft) x 50.00 ft x (21.33 / 23.94 ft)
 (88.39 m / 88.39 m) x 15.24 m  x (6.50 / 7.30 m)

Armament:
      6 - 7.00" / 178 mm 45.0 cal guns - 172.00lbs / 78.02kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts , 1907 Model
   2 x Triple mounts on centreline ends, evenly spread
      2 - 5.50" / 140 mm 45.0 cal guns - 83.90lbs / 38.05kg shells, 150 per gun
   Breech loading guns in turret on barbette mount , 1907 Model
   1 x Twin mount on centreline, forward deck centre
  1 raised mount
 Weight of broadside 1,200 lbs / 1,200 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Ends: Unarmoured

   - Torpedo Bulkhead:
  1.00" / 25 mm 180.00 ft / 54.86 m 21.33 ft / 6.50 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: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm

   - Armour deck: 3.00" / 76 mm

Machinery:
 Coal fired boilers, complex reciprocating steam engines, 
 Direct drive, 1 shaft, 11,056 ihp / 8,248 Kw = 20.00 kts
 Range 5,300nm at 14.00 kts
 Bunker at max displacement = 1,559 tons (100% coal)

Complement:
 270 - 352

Cost:
 £0.351 million / $1.402 million

Distribution of weights at normal displacement:
 Armament: 273 tons, 6.2 %
 Armour: 902 tons, 20.4 %
    - Belts: 0 tons, 0.0 %
    - Torpedo bulkhead: 142 tons, 3.2 %
    - Armament: 244 tons, 5.5 %
    - Armour Deck: 516 tons, 11.7 %
    - Conning Tower: 0 tons, 0.0 %
 Machinery: 850 tons, 19.2 %
 Hull, fittings & equipment: 1,485 tons, 33.5 %
 Fuel, ammunition & stores: 1,055 tons, 23.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   5,400 lbs / 2,449 Kg = 31.5 x 7.0 " / 178 mm shells or 1.4 torpedoes
 Stability (Unstable if below 1.00): 1.25
 Metacentric height 2.6 ft / 0.8 m
 Roll period: 12.9 seconds
 Steadiness - As gun platform (Average = 50 %): 63 %
   - Recoil effect (Restricted arc if above 1.00): 0.54
 Seaboat quality  (Average = 1.00): 1.27

Hull form characteristics:
 Hull has a flush deck,
   a ram bow and a round stern
 Block coefficient (normal/deep): 0.501 / 0.516
 Length to Beam Ratio: 5.80 : 1
 'Natural speed' for length: 17.03 kts
 Power going to wave formation at top speed: 58 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 0.00 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 %,  17.00 ft / 5.18 m,  15.00 ft / 4.57 m
    - Forward deck: 30.00 %,  15.00 ft / 4.57 m,  15.00 ft / 4.57 m
    - Aft deck: 35.00 %,  15.00 ft / 4.57 m,  15.00 ft / 4.57 m
    - Quarter deck: 15.00 %,  15.00 ft / 4.57 m,  16.00 ft / 4.88 m
    - Average freeboard:  15.24 ft / 4.64 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 144.4 %
  - Above water (accommodation/working, high = better): 98.4 %
 Waterplane Area: 9,297 Square feet or 864 Square metres
 Displacement factor (Displacement / loading): 120 %
 Structure weight / hull surface area: 93 lbs/sq ft or 452 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.87
  - Longitudinal: 3.49
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is adequate
 Good seaboat, rides out heavy weather easily