This is about 50%, or so, larger than planned: Ger/CA/1915

The Ger/CA/1915 (or whatever the year was) fast armoured cruiser was originally planned to be just 14,000 tons (!). That was over optimistic by a good bit. The only way that the other might just possibly have worked would have been to have very high power output machinery. The basic idea was to have a 6in armour basis with 8-9.4in guns (25 ton) with a 419lb APC shot. The secondary armament was 106in guns (5.5 ton) with a 101 lb. shot. The armour deck was thick, being 4inches. I had actually wanted a lower splinter deck of 3in. which I omitted here, as it seemed too extreme, even for me. This is the Springsharp report:

Ger/CA/1915, Germany Armoured Cruiser laid down 1915 (Engine 1927)

Displacement:
 21,233 t light; 22,005 t standard; 23,500 t normal; 24,696 t full load

Dimensions: Length overall / water x beam x draught
 726.08 ft / 725.00 ft x 80.00 ft x 25.00 ft (normal load)
 221.31 m / 220.98 m x 24.38 m  x 7.62 m

Armament:
      8 - 9.40" / 239 mm guns (4x2 guns), 419.00lbs / 190.06kg shells, 1915 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      10 - 6.00" / 152 mm guns in single mounts, 101.00lbs / 45.81kg shells, 1915 Model
   Quick firing guns in deck mounts with hoists
   on side ends, evenly spread, 2 raised mounts - superfiring
 Weight of broadside 4,362 lbs / 1,979 kg
 Shells per gun, main battery: 120

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 555.00 ft / 169.16 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 118 % of normal length

   - Torpedo Bulkhead:
  1.00" / 25 mm 555.00 ft / 169.16 m 22.00 ft / 6.71 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 4.00" / 102 mm  6.00" / 152 mm
 2nd: 2.00" / 51 mm       -         -

   - Armour deck: 4.00" / 102 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 156,174 shp / 116,506 Kw = 33.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 2,691 tons

Complement:
 948 - 1,233

Cost:
 £2.757 million / $11.029 million

Distribution of weights at normal displacement:
 Armament: 550 tons, 2.3 %
 Armour: 6,910 tons, 29.4 %
    - Belts: 2,322 tons, 9.9 %
    - Torpedo bulkhead: 452 tons, 1.9 %
    - Armament: 985 tons, 4.2 %
    - Armour Deck: 3,044 tons, 13.0 %
    - Conning Tower: 106 tons, 0.5 %
 Machinery: 4,930 tons, 21.0 %
 Hull, fittings & equipment: 8,843 tons, 37.6 %
 Fuel, ammunition & stores: 2,267 tons, 9.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   34,067 lbs / 15,453 Kg = 82.0 x 9.4 " / 239 mm shells or 4.1 torpedoes
 Stability (Unstable if below 1.00): 1.17
 Metacentric height 4.8 ft / 1.5 m
 Roll period: 15.4 seconds
 Steadiness - As gun platform (Average = 50 %): 59 %
   - Recoil effect (Restricted arc if above 1.00): 0.52
 Seaboat quality  (Average = 1.00): 1.19

Hull form characteristics:
 Hull has raised forecastle, rise forward of midbreak
 Block coefficient: 0.567
 Length to Beam Ratio: 9.06 : 1
 'Natural speed' for length: 26.93 kts
 Power going to wave formation at top speed: 56 %
 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:  31.00 ft / 9.45 m
    - Forecastle (20 %): 29.00 ft / 8.84 m (28.00 ft / 8.53 m aft of break)
    - Mid (73 %):  28.00 ft / 8.53 m (20.00 ft / 6.10 m aft of break)
    - Quarterdeck (15 %): 20.00 ft / 6.10 m
    - Stern:  20.00 ft / 6.10 m
    - Average freeboard: 26.20 ft / 7.99 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 115.2 %
  - Above water (accommodation/working, high = better): 219.2 %
 Waterplane Area: 41,138 Square feet or 3,822 Square metres
 Displacement factor (Displacement / loading): 111 %
 Structure weight / hull surface area: 139 lbs/sq ft or 677 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.34
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent