Cliff's "BBX" design

My friend Cliff had this concept for what seemed like a breakthrough battleship design. For whatever reason, he had switched from high speed to moderate speed and heavy armor and guns. The ship was built around the 20in/45 gun (202 ton). The APC shot was 4,370lbs with a muzzle velocity of 2,700 ft/sec. The specs for the ship were:

• dimensions: 800ft x 135ft x 36.5ft (light displacement)
• legend displacement: 70,000 tons
• armament: 9-20in/45 (202 ton) and 24-5in QF (5 ton)
• speed: 20 knots
• power: 89,300 SHP
• machinery basis: 30SHP/ton of machinery

The weight breakdown:

• hull: 18,800 tons
• aux. machinery: 2,450 tons
• machinery: 2,980 tons
• armament: 4,461 tons
• protection: 35,709 tons
• miscellaneous: 5,600 tons