The Montana class battleships were going to have the following characteristics:
Displacement: 72,000 tons full load
Length: 924 ft.
Beam: 121 feet (I think too big for the Panama Canal)
Draft: 36 feet
Speed: 30 knots
Crew: 2,800 (As Flagship)
Armament:
12 x 16-inch/50 cal guns (4 turrets x 3)
20 x 5-inch/54 cal guns (10 x 2 Turrets)
40 x Bofors 40mm AA guns
54 x 20mm AA guns
Armor:
16.1 inches (409 mm) belt armor tapering to 10.1 inch
7.2 inches (183 mm) side-belt armor tapering to 1"
18 inches (457 mm) forward bilhead armor
15.25 inches (387 mm) aft bulkhead armor
21.3 inches (541 mm) barbette armor
22.5 inches (572 mm) turret face armor
9.9 inches (251 mm) turret roof armor
9.3 inches (236 mm) Deck Armor
Aircraft:
4 x O2SU Kingfisher Patrol float planes
2 x Stern Catapults
With their twelve 16-inch/50 cal guns, and their better fire control, I think they would have been a deadly match against the Yamato class...but we shall never know.
Here's how the first in class, the USS Montana, BB-67, would have looked:
View attachment 18473
View attachment 18472
View attachment 18471
Five were planned and their construction approved, but before they started building them in 1942, the absolute need for Essex class carriers caused them to be first delayed, and then canceled.
By 1943 it was clear to US naval planners that the US Navy had plenty of battleships and that their time, as the capitol ship of the Navy, was past. As I say, more Essex carriers were ordered instead.
One thing did come of them, their hull design was used for the Midway class carriers, providing better maneuverability and stability for that carrier design.