If you can live with 6in side armor, the GB/CB/1905 Mod.3 becomes much smaller

I experimented with a GB/CB/1905 Mod.3 design, in Springsharp, where the side armor is reduced to 6in. I kept the turret faces, barbettes, and CT at 8in. That works quite nicely, still with 8-12in and 12-6in guns, with 33 knot speed. I kept the deck armor at 3in.

GB/CB/1905 Mod.3, Enter country Enter ship type laid down 1905 (Engine 1917)

Displacement:
 28,764 t light; 29,831 t standard; 32,265 t normal; 34,213 t full load

Dimensions: Length overall / water x beam x draught
 770.00 ft / 770.00 ft x 95.00 ft x 31.00 ft (normal load)
 234.70 m / 234.70 m x 28.96 m  x 9.45 m

Armament:
      8 - 12.00" / 305 mm guns (4x2 guns), 864.00lbs / 391.90kg shells, 1905 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, all raised mounts - superfiring
      12 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1905 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
 Weight of broadside 8,208 lbs / 3,723 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 530.00 ft / 161.54 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 106 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.50" / 38 mm 530.00 ft / 161.54 m 26.00 ft / 7.92 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 4.00" / 102 mm  8.00" / 203 mm
 2nd: 2.00" / 51 mm       -         -

   - Armour deck: 3.00" / 76 mm, Conning tower: 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 181,975 shp / 135,753 Kw = 33.00 kts
 Range 7,500nm at 15.00 kts
 Bunker at max displacement = 4,382 tons

Complement:
 1,203 - 1,564

Cost:
 £2.802 million / $11.210 million

Distribution of weights at normal displacement:
 Armament: 1,026 tons, 3.2 %
 Armour: 7,736 tons, 24.0 %
    - Belts: 2,269 tons, 7.0 %
    - Torpedo bulkhead: 765 tons, 2.4 %
    - Armament: 1,828 tons, 5.7 %
    - Armour Deck: 2,700 tons, 8.4 %
    - Conning Tower: 175 tons, 0.5 %
 Machinery: 6,671 tons, 20.7 %
 Hull, fittings & equipment: 13,331 tons, 41.3 %
 Fuel, ammunition & stores: 3,501 tons, 10.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   40,537 lbs / 18,387 Kg = 46.9 x 12.0 " / 305 mm shells or 5.0 torpedoes
 Stability (Unstable if below 1.00): 1.09
 Metacentric height 5.4 ft / 1.7 m
 Roll period: 17.1 seconds
 Steadiness - As gun platform (Average = 50 %): 60 %
   - Recoil effect (Restricted arc if above 1.00): 0.67
 Seaboat quality  (Average = 1.00): 1.20

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.498
 Length to Beam Ratio: 8.11 : 1
 'Natural speed' for length: 27.75 kts
 Power going to wave formation at top speed: 54 %
 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:  32.00 ft / 9.75 m
    - Forecastle (20 %): 30.00 ft / 9.14 m
    - Mid (67 %):  30.00 ft / 9.14 m (22.00 ft / 6.71 m aft of break)
    - Quarterdeck (15 %): 22.00 ft / 6.71 m
    - Stern:  22.00 ft / 6.71 m
    - Average freeboard: 27.52 ft / 8.39 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 115.5 %
  - Above water (accommodation/working, high = better): 214.0 %
 Waterplane Area: 48,650 Square feet or 4,520 Square metres
 Displacement factor (Displacement / loading): 110 %
 Structure weight / hull surface area: 178 lbs/sq ft or 868 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.53
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent