Oh wow. It's actually possible to cramp 9 20.1"/45 onto one 70,000tonne ship! Note however, how bloody angled the main belt is, along with a super high belt to compensate. Also, hell knows whether 9" deck is sufficient against 20"/45 shells! (I can sense Steve twitching away!

)
John II Komnenos, Byzantine Empire Battleship laid down 1927
Displacement:
65,900 t light; 69,795 t standard; 73,833 t normal; 77,064 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(784.55 ft / 767.72 ft) x 137.80 ft x (37.24 / 38.57 ft)
(239.13 m / 234.00 m) x 42.00 m x (11.35 / 11.76 m)
Armament:
9 - 20.10" / 511 mm 45.0 cal guns - 4,400.01lbs / 1,995.81kg shells, 90 per gun
Breech loading guns in turret on barbette mounts, 1927 Model
3 x Triple mounts on centreline ends, majority forward
1 raised mount - superfiring
20 - 5.00" / 127 mm 38.0 cal guns - 59.33lbs / 26.91kg shells, 500 per gun
Dual purpose guns in deck and hoist mounts, 1927 Model
10 x Twin mounts on sides, evenly spread
4 raised mounts
40 - 1.57" / 40.0 mm 56.0 cal guns - 2.11lbs / 0.96kg shells, 2,000 per gun
Anti-air guns in deck mounts, 1927 Model
10 x Quad mounts on side ends, majority aft
4 raised mounts - superfiring
40 - 0.79" / 20.0 mm 70.0 cal guns - 0.27lbs / 0.12kg shells, 2,000 per gun
Anti-air guns in deck mounts, 1927 Model
10 x Quad mounts on side ends, majority aft
16 - 0.50" / 12.7 mm 12.0 cal guns - 0.05lbs / 0.02kg shells, 4,000 per gun
Anti-air guns in deck mounts, 1927 Model
16 x 4-gun mounts on centreline, aft deck forward
Weight of broadside 40,883 lbs / 18,544 kg
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 16.0" / 406 mm 390.00 ft / 118.87 m 22.00 ft / 6.71 m
Ends: Unarmoured
Main Belt covers 78 % of normal length
Main Belt inclined 25.00 degrees (positive = in)
- Torpedo Bulkhead - Additional damage containing bulkheads:
4.00" / 102 mm 400.00 ft / 121.92 m 40.00 ft / 12.19 m
Beam between torpedo bulkheads 100.00 ft / 30.48 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 26.0" / 660 mm 12.0" / 305 mm 22.0" / 559 mm
2nd: 3.00" / 76 mm 2.00" / 51 mm 3.00" / 76 mm
3rd: 0.50" / 13 mm - -
4th: 0.50" / 13 mm - -
5th: 0.50" / 13 mm - -
- Armoured deck - multiple decks:
For and Aft decks: 9.00" / 229 mm
Forecastle: 3.00" / 76 mm Quarter deck: 5.00" / 127 mm
- Conning towers: Forward 16.00" / 406 mm, Aft 8.00" / 203 mm
Machinery:
Oil fired boilers, steam turbines,
Electric motors, 4 shafts, 86,395 shp / 64,451 Kw = 24.00 kts
Range 9,000nm at 14.00 kts
Bunker at max displacement = 7,269 tons
Complement:
2,239 - 2,911
Cost:
£22.638 million / $90.551 million
Distribution of weights at normal displacement:
Armament: 5,671 tons, 7.7 %
- Guns: 5,671 tons, 7.7 %
Armour: 29,695 tons, 40.2 %
- Belts: 6,641 tons, 9.0 %
- Torpedo bulkhead: 2,368 tons, 3.2 %
- Armament: 6,990 tons, 9.5 %
- Armour Deck: 12,786 tons, 17.3 %
- Conning Towers: 910 tons, 1.2 %
Machinery: 2,727 tons, 3.7 %
Hull, fittings & equipment: 27,677 tons, 37.5 %
Fuel, ammunition & stores: 7,933 tons, 10.7 %
Miscellaneous weights: 130 tons, 0.2 %
- Hull above water: 30 tons
- On freeboard deck: 100 tons
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
122,854 lbs / 55,726 Kg = 30.3 x 20.1 " / 511 mm shells or 26.0 torpedoes
Stability (Unstable if below 1.00): 1.20
Metacentric height 11.3 ft / 3.4 m
Roll period: 17.3 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.58
Seaboat quality (Average = 1.00): 1.31
Hull form characteristics:
Hull has a flush deck,
an extended bulbous bow and large transom stern
Block coefficient (normal/deep): 0.656 / 0.661
Length to Beam Ratio: 5.57 : 1
'Natural speed' for length: 32.66 kts
Power going to wave formation at top speed: 47 %
Trim (Max stability = 0, Max steadiness = 100): 54
Bow angle (Positive = bow angles forward): 25.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 36.09 ft / 11.00 m, 21.65 ft / 6.60 m
- Forward deck: 30.00 %, 21.65 ft / 6.60 m, 21.65 ft / 6.60 m
- Aft deck: 35.00 %, 21.65 ft / 6.60 m, 21.65 ft / 6.60 m
- Quarter deck: 15.00 %, 21.65 ft / 6.60 m, 21.65 ft / 6.60 m
- Average freeboard: 22.81 ft / 6.95 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 77.5 %
- Above water (accommodation/working, high = better): 155.3 %
Waterplane Area: 85,023 Square feet or 7,899 Square metres
Displacement factor (Displacement / loading): 107 %
Structure weight / hull surface area: 274 lbs/sq ft or 1,339 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.55
- Overall: 1.00
Excellent machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily