Well, I've just done a test with a 1936 design BC (normal displacement of 37,588 tons) thowing everything off the ship (and I mean everything). This will leave you with only the "Hull, fittings & equipment" bit (don't know how to break that number down). The hull weight (+ fittings and equipment) given was 13,357 tons.
In order to get to 13,357 tons, I had to change the draft from 32 feet and 9.6 inches to 11 feet and 7.9 inches. That's a bit more than 21 feet I lost there.
That makes it almost fall into the heavy cruiser category. :-)
As for the Hobart, I got down to this:
Hobart, Australia CV laid down 1919
Displacement:
26,306 t light; 26,985 t standard; 30,304 t normal; 32,838 t full load
Loading submergence 1,282 tons/feet
Dimensions:
634.50 ft x 104.00 ft x 28.60 ft (normal load)
193.40 m x 31.70 m x 8.72 m
Armament:
12 - 4.50" / 114 mm guns (6 Main turrets x 2 guns)
10 - 4.00" / 102 mm guns
15 - 0.50" / 13 mm guns
Weight of broadside 868 lbs / 394 kg
Armour:
Belt 5.00" / 127 mm, ends unarmoured
Belts cover 113 % of normal area
Main turrets 2.00" / 51 mm, 2nd gun shields 1.00" / 25 mm
Light gun shields 1.00" / 25 mm
Armour deck 3.00" / 76 mm, Torpedo bulkhead 3.00" / 76 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 170,338 shp / 127,072 Kw = 31.48 kts
Range 28,500nm at 10.00 kts
Complement:
1,148 - 1,492
Cost:
£4.055 million / $16.221 million
Distribution of weights at normal displacement:
Armament: 108 tons, 0.4 %
Armour: 5,254 tons, 17.3 %
Belts: 1,241 tons, 4.1 %, Armament: 214 tons, 0.7 %, Armour Deck: 2,489 tons, 8.2 %
Conning Tower: 0 tons, 0.0 %, Torpedo bulkhead: 1,309 tons, 4.3 %
Machinery: 6,049 tons, 20.0 %
Hull, fittings & equipment: 8,495 tons, 28.0 %
Fuel, ammunition & stores: 3,998 tons, 13.2 %
Miscellaneous weights: 6,400 tons, 21.1 %
Metacentric height 6.4
Remarks:
Hull space for machinery, storage & compartmentation is cramped
Room for accommodation & workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.10
Shellfire needed to sink: 26,288 lbs / 11,924 Kg = 577.0 x 4.5 " / 114 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 3.9
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 70 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.04
Relative quality as seaboat: 1.04
Hull form characteristics:
Block coefficient: 0.562
Sharpness coefficient: 0.41
Hull speed coefficient 'M': 6.23
'Natural speed' for length: 25.19 kts
Power going to wave formation at top speed: 62 %
Trim: 67
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)
Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 112.7 %
Relative accommodation and working space: 193.5 %
(Average = 100%)
Displacement factor: 123 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.95
(Structure weight / hull surface area: 131 lbs / square foot or 637 Kg / square metre)
Relative longitudinal hull strength: 1.72
(for 26.00 ft / 7.92 m average freeboard, freeboard adjustment 7.10 ft)
Relative composite hull strength: 1.01
Walter