How could the following battleship design have been possible in less than 60000 tons?

Question

1934 FUJIMOTO BATTLESHIP DESIGN <8>

Displacement:(tons)<9>
Standard: 50,000
Trials: 59,000
Length: 951'6"
Beam: 124'8"
Draft:
Trials: 32'2"
Armament:
Main Battery: 12-20" (4 x 3)
Secondary: 16-155mm
Anti-Aircraft: 10-5"
some machine guns
Aircraft: 12 (3 catapults)
Armor:
Main Belt: 16"
Deck: 11"
Power Plant: mixed turbine/diesel,
140,000 shp
Speed: 30 knots
Range: 12,000 nautical miles at 16 knots

I got it off of this site:


Here are some conjectural pictures of it:


But, how could you fit 12 x 20" guns on a ship less than 60 000 tons?

Answer 1

I would guess the best way to limit the tonnage and still fit all that in would be to limit the amount of superstructure. If you keep the ship low, you can reduce a lot of weight. I would also guess they would be able to reduce the thickness of some of the interior bulkheads and floors a bit. It all adds up.

But then again, it's also possible that they discovered that it just wasn't doable, after all they didn't build it.