A protected 9.2-inch cruiser design

What armour and torpedo protection could these alternative cruisers carry?

One 12,500-ton sketch carries a 7-inch belt, 4.5-inch deck, internal protective deck, and twin-hull anti-flooding; an 18,000-ton ship could add more guns and protection.

A six-gun design within roughly 12,500 tons carries a 7-inch belt and a 4.5-inch armoured deck. An additional internal protective deck and twin-hull anti-flooding arrangement improve survival below the waterline. These figures come from a concrete Ultimate Admiral design exercise rather than a claim that the Royal Navy drew the ship historically. Expanding the concept to 18,000 tons could support at least nine guns while retaining or improving the armour and torpedo protection.