WesWorld

Hmmmm. Are you really intending a rebuild of a BB in 1936 that includes NO AA weapons heavier than a 50mm? Historically, while she didn't carry a lot of heavy AA and kept the casemate weapons unlike many of her contemporaries, the class was refitted to carry 8 5" AA guns....

I will admit that I never gave that much thought. There should be some space on the ship for the Japanese twin 5" mounts (I was thinking too much about the US 5" which requires more space) and looking at the picture, I could move the catapult and crane to the stern for additional space amidship for a few more mounts.
Will rework the design a bit.

Nagato, Japan Senkan laid down 1916 (Engine 1937)

Displacement:
38,842 t light; 41,123 t standard; 45,915 t normal; 49,750 t full load

Dimensions: Length overall / water x beam x draught
809.41 ft / 800.00 ft x 97.00 ft (Bulges 108.00 ft) x 31.00 ft (normal load)
246.71 m / 243.84 m x 29.57 m (Bulges 32.92 m) x 9.45 m

Armament:
8 - 16.14" / 410 mm guns (4x2 guns), 2,300.00lbs / 1,043.26kg shells, 1933 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
20 - 5.00" / 127 mm guns in single mounts, 55.00lbs / 24.95kg shells, 1932 Model
Quick firing guns in casemate mounts
on side, all amidships
20 guns in hull casemates - Limited use in heavy seas
8 - 5.00" / 127 mm guns (4x2 guns), 55.00lbs / 24.95kg shells, 1932 Model
Dual purpose guns in deck mounts with hoists
on side, evenly spread, all raised mounts
24 - 1.97" / 50.0 mm guns (12x2 guns), 4.00lbs / 1.81kg shells, 1935 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 6 raised mounts
36 - 0.98" / 25.0 mm guns (12x3 guns), 0.57lbs / 0.26kg shells, 1935 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 4 raised mounts
Weight of broadside 20,057 lbs / 9,097 kg
Shells per gun, main battery: 120

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 14.0" / 356 mm 490.00 ft / 149.35 m 12.00 ft / 3.66 m
Ends: Unarmoured
Main Belt covers 94% of normal length

- Torpedo Bulkhead and Bulges:
2.00" / 51 mm 490.00 ft / 149.35 m 30.00 ft / 9.14 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 16.0" / 406 mm 10.0" / 254 mm 14.0" / 356 mm
2nd: 4.00" / 102 mm - 4.00" / 102 mm
3rd: 3.00" / 76 mm 1.00" / 25 mm 2.00" / 51 mm
4th: 1.00" / 25 mm - -
5th: 1.00" / 25 mm - -

- Armour deck: 5.25" / 133 mm, Conning tower: 16.00" / 406 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 140,000 shp / 104,440 Kw = 28.91 kts
Range 10,420nm at 18.00 kts
Bunker at max displacement = 8,627 tons

Complement:
1,567 - 2,038

Cost:
£6.323 million / $25.294 million

Distribution of weights at normal displacement:
Armament: 2,335 tons, 5.1%
Armour: 14,650 tons, 31.9%
- Belts: 3,544 tons, 7.7%
- Torpedo bulkhead: 1,088 tons, 2.4%
- Armament: 4,064 tons, 8.9%
- Armour Deck: 5,512 tons, 12.0%
- Conning Tower: 442 tons, 1.0%
Machinery: 3,880 tons, 8.5%
Hull, fittings & equipment: 17,177 tons, 37.4%
Fuel, ammunition & stores: 7,073 tons, 15.4%
Miscellaneous weights: 800 tons, 1.7%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
62,725 lbs / 28,451 Kg = 29.8 x 16.1 " / 410 mm shells or 9.8 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 6.1 ft / 1.9 m
Roll period: 18.4 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0.59
Seaboat quality (Average = 1.00): 1.04

Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0.600
Length to Beam Ratio: 7.41 : 1
'Natural speed' for length: 28.28 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 21.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.52 ft / 7.47 m
- Forecastle (20%): 21.51 ft / 6.56 m
- Mid (50%): 21.51 ft / 6.56 m
- Quarterdeck (15%): 14.50 ft / 4.42 m (21.50 ft / 6.55 m before break)
- Stern: 14.50 ft / 4.42 m
- Average freeboard: 20.70 ft / 6.31 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 86.6%
- Above water (accommodation/working, high = better): 148.4%
Waterplane Area: 56,755 Square feet or 5,273 Square metres
Displacement factor (Displacement / loading): 110%
Structure weight / hull surface area: 209 lbs/sq ft or 1,022 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 1.03
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

Probably an improvement. They're certainly pretty quick, and quite long-legged.

Range is roughly the same as the original (~100nm more range). Speed is about 0.9 knots more than the original.
The DPs would be at the aft and forward superstructures. I could still move the aircraft equipment aft rearrange things a bit, alter the lower part of the superstructure for a few more twin 5" in the center of the ship...