Playing around with anachronisms: armoured cruiser Shannon

I have long enjoyed playing with either rebuilding or providing anachronistic characteristics to the early British ironclads. On January 20, 1999, had sketched a picture of the armoured cruiser Shannon, if it had perhaps either been rebuilt or built to a later style design. My drawing had three funnels and a heavy pole foremast. The secondary and tertiary armaments were in casemates. The armament was 4-8in/45, 6-6in/45, and 8-4in QF guns. This is the Springsharp report:

HMS Shannon, Great Britain Armoured Cruiser laid down 1895

Displacement:
 5,272 t light; 5,385 t standard; 5,670 t normal; 5,898 t full load

Dimensions: Length overall / water x beam x draught
 260.00 ft / 260.00 ft x 54.00 ft x 21.00 ft (normal load)
 79.25 m / 79.25 m x 16.46 m  x 6.40 m

Armament:
      4 - 8.00" / 203 mm guns (2x2 guns), 256.00lbs / 116.12kg shells, 1895 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread
      6 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1895 Model
   Breech loading guns in casemate mounts 
   on side, all amidships
      8 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1895 Model
   Quick firing guns in casemate mounts 
   on side, all amidships
   8 guns in hull casemates - Limited use in heavy seas
 Weight of broadside 1,928 lbs / 875 kg
 Shells per gun, main battery: 0

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 8.00" / 203 mm 170.00 ft / 51.82 m 9.00 ft / 2.74 m
 Ends: 5.00" / 127 mm   90.00 ft / 27.43 m 16.00 ft / 4.88 m
 Upper: 6.00" / 152 mm 170.00 ft / 51.82 m 8.00 ft / 2.44 m
   Main Belt covers 101 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 170.00 ft / 51.82 m 20.00 ft / 6.10 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 5.00" / 127 mm  8.00" / 203 mm
 2nd: 6.00" / 152 mm 6.00" / 152 mm  6.00" / 152 mm
 3rd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 8.00" / 203 mm

Machinery:
 Coal fired boilers, complex reciprocating steam engines, 
 Direct drive, 2 shafts, 6,010 ihp / 4,484 Kw = 16.00 kts
 Range 4,300nm at 8.00 kts
 Bunker at max displacement = 513 tons (100% coal)

Complement:
 326 - 424

Cost:
 £0.530 million / $2.118 million

Distribution of weights at normal displacement:
 Armament: 241 tons, 4.3 %
 Armour: 2,336 tons, 41.2 %
    - Belts: 1,194 tons, 21.1 %
    - Torpedo bulkhead: 126 tons, 2.2 %
    - Armament: 555 tons, 9.8 %
    - Armour Deck: 406 tons, 7.2 %
    - Conning Tower: 55 tons, 1.0 %
 Machinery: 1,019 tons, 18.0 %
 Hull, fittings & equipment: 1,676 tons, 29.6 %
 Fuel, ammunition & stores: 398 tons, 7.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   6,509 lbs / 2,953 Kg = 25.4 x 8.0 " / 203 mm shells or 1.4 torpedoes
 Stability (Unstable if below 1.00): 1.09
 Metacentric height 2.4 ft / 0.7 m
 Roll period: 14.8 seconds
 Steadiness - As gun platform (Average = 50 %): 74 %
   - Recoil effect (Restricted arc if above 1.00): 0.62
 Seaboat quality  (Average = 1.00): 1.48

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.673
 Length to Beam Ratio: 4.81 : 1
 'Natural speed' for length: 16.12 kts
 Power going to wave formation at top speed: 57 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -2.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  20.00 ft / 6.10 m
    - Forecastle (20 %): 17.00 ft / 5.18 m
    - Mid (50 %):  17.00 ft / 5.18 m
    - Quarterdeck (15 %): 17.00 ft / 5.18 m
    - Stern:  17.00 ft / 5.18 m
    - Average freeboard: 17.24 ft / 5.25 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 140.4 %
  - Above water (accommodation/working, high = better): 109.1 %
 Waterplane Area: 10,984 Square feet or 1,020 Square metres
 Displacement factor (Displacement / loading): 90 %
 Structure weight / hull surface area: 97 lbs/sq ft or 474 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.86
  - Longitudinal: 3.79
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is adequate
 Ship has slow, easy roll, a good, steady gun platform
 Good seaboat, rides out heavy weather easily