I was surprised that I had stability problems with the GB/BB/1912

I'm not sure that I have the specs exactly right, as I don't have the book along to check, but I know the broad parameters. The idea was a 25 knot ship with 9-15in guns and good armor. I worked from those premises. This is the report of what I ended up with, in order to have a balance of stability, strength, and seakeeping ability. I had to use the slider in Springsharp to get adequate stability (seems like cheating).

GB/BB/1912, Great Britain Battleship laid down 1912 (Engine 1927)

Displacement:
	32,047 t light; 33,596 t standard; 35,717 t normal; 37,413 t full load

Dimensions: Length overall / water x beam x draught
	650.00 ft / 650.00 ft x 100.00 ft x 32.00 ft (normal load)
	198.12 m / 198.12 m x 30.48 m  x 9.75 m

Armament:
      9 - 15.00" / 381 mm guns (3x3 guns), 1,687.50lbs / 765.44kg shells, 1912 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline ends, majority forward, all raised mounts - superfiring
      12 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1912 Model
	  Quick firing guns in deck mounts with hoists
	  on side, all amidships, all raised mounts - superfiring
	Weight of broadside 16,484 lbs / 7,477 kg
	Shells per gun, main battery: 90

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	14.0" / 356 mm	485.00 ft / 147.83 m	17.00 ft / 5.18 m
	Ends:	Unarmoured
	  Main Belt covers 115 % of normal length

   - Torpedo Bulkhead:
		2.00" / 51 mm	485.00 ft / 147.83 m	26.00 ft / 7.92 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	14.0" / 356 mm	7.00" / 178 mm		14.0" / 356 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 7.00" / 178 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Direct drive, 4 shafts, 99,853 shp / 74,491 Kw = 27.00 kts
	Range 8,500nm at 14.00 kts
	Bunker at max displacement = 3,817 tons

Complement:
	1,298 - 1,688

Cost:
	£3.294 million / $13.175 million

Distribution of weights at normal displacement:
	Armament: 2,060 tons, 5.8 %
	Armour: 12,845 tons, 36.0 %
	   - Belts: 4,891 tons, 13.7 %
	   - Torpedo bulkhead: 933 tons, 2.6 %
	   - Armament: 3,336 tons, 9.3 %
	   - Armour Deck: 3,521 tons, 9.9 %
	   - Conning Tower: 164 tons, 0.5 %
	Machinery: 3,152 tons, 8.8 %
	Hull, fittings & equipment: 13,990 tons, 39.2 %
	Fuel, ammunition & stores: 3,670 tons, 10.3 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  40,894 lbs / 18,549 Kg = 24.2 x 15.0 " / 381 mm shells or 6.8 torpedoes
	Stability (Unstable if below 1.00): 1.01
	Metacentric height 5.1 ft / 1.6 m
	Roll period: 18.6 seconds
	Steadiness	- As gun platform (Average = 50 %): 48 %
			- Recoil effect (Restricted arc if above 1.00): 0.68
	Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
	Hull has rise forward of midbreak
	Block coefficient: 0.601
	Length to Beam Ratio: 6.50 : 1
	'Natural speed' for length: 25.50 kts
	Power going to wave formation at top speed: 55 %
	Trim (Max stability = 0, Max steadiness = 100): 44
	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:		30.00 ft / 9.14 m
	   - Forecastle (67 %):	25.00 ft / 7.62 m
	   - Mid (67 %):		25.00 ft / 7.62 m (17.00 ft / 5.18 m aft of break)
	   - Quarterdeck (15 %):	17.00 ft / 5.18 m
	   - Stern:		17.00 ft / 5.18 m
	   - Average freeboard:	23.70 ft / 7.22 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 90.1 %
		- Above water (accommodation/working, high = better): 118.7 %
	Waterplane Area: 47,584 Square feet or 4,421 Square metres
	Displacement factor (Displacement / loading): 100 %
	Structure weight / hull surface area: 205 lbs/sq ft or 1,001 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.94
		- Longitudinal: 1.70
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is adequate
	Room for accommodation and workspaces is adequate