Vickers Export Design 646

The design history of the Japanese Nagato class battleships, the world's first and fastest 16"/410mm armed battleships is long, and partially documented. The sentence being the Nagato class not only the first indeginiously designed Japanese Battleship or the first Battleship entirely designed by Yuzuru Hiraga is not accurate. Before the first known Japanese design: A-102 which could be connected to the Nagato class in 1916 was born, the famous British ship building firm Vickers offered four proposals to the Imperial Japanese Navy in 1913 armed with 16" cannons: Designs 646,646A,647 and 647A. Designs 646 and 647 were 16"/40 while the A sub variants were 16"/44 armed proposals. Norman Friedman briefly mentions these offers with some info on dimensions and armament: 4 twin 16" turrets, 16x 6" secondary guns, 8 submerged torpedo tubes and other guns as on the Kongo eg 16x 3" guns. Other noteworthy feature the relative high speed of these proposals, outmatching any battleships of the time and reaching the same values as the first generation battlecruisers like the Invincible class.
It is very likely that these proposals heavily influenced the the creation of the Nagato class battleships, both in size, speed and armament!
For the basis of this design I've chosen a modified and lengthened Queen Elizabeth class battleship with some alterations on the bridge and mainmasts.

Design 646A was a slight modification of the baseline design 646, using 406mm/44 cannons (16"/44) rather the shorter /40 calibre one. This difference in main weaponry together associated with a somewhat different turret carrying them resulted a net increase in displacement by 800tons to 29.800tons. For this design to not look like a longer barrelled Design 646 I've repositioned the mainmast, moving it just behind the 3rd turret as well as changing the main crane's facing and modelled the turrets after that used on HMS Hood: Mark II, previously I've used a somewhat enlarged turret of the Queen Elizabeth class eg the Mark I turrets

Design 646 had the following characteristics:
Dimensions: 184,4 (pp) x 28,65 x 8,7 meters
Displacement: 29.000tons (standard)
Armour: 305mm Belt
Engines: Unknown, likely 68.000shp
Speed: Unknown, likely 44-46km/h (24-25knots)
Armaments:
4x2 406mm/40 (16"/40) Vickers Mark A Cannons,
16x1 152mm/50 (6"/50) Vickers Mark S Guns,
16x1 76mm/40 (3"/40) Vickers Mark N Guns,
8x1 533mm Underwater Torpedo Tubes

Design 646A had the following characteristics:
Dimensions: 184,4 (pp) x 28,65 x 8,7 meters
Displacement: 29.800tons (standard)
Armour: 305mm Belt
Engines: Unknown, likely 69.000shp
Speed: Unknown, likely 44-46km/h (24-25knots)
Armaments:
4x2 406mm/44 (16"/44) Vickers Mark A Cannons,
16x1 152mm/50 (6"/50) Vickers Mark S Guns,
16x1 76mm/40 (3"/40) Vickers Mark N Guns,
8x1 533mm Underwater Torpedo Tubes