My attempt at a Bartolomeo Colleoni-style light cruiser

My attempt at an Italian-style light cruiser caught my eye, tonight. I am guessing that my design dates from about 1973. The standard displacement was to be 5,000 tons with a 6,500 ton full load displacement. The dimensions were 555ft x 50ft x 16.3ft, with a 30ft hull depth. The coefficients were Cp=0.56 and Cm=0.90. The hull structure is rather light, the factor being 2.85 x 10^-3. That produced a hull weight of 2,370 tons. The power was 90,000 SHP normal and 108,000 SHP on overload. The machinery weight was 1,800 tons. That means that the overload SHP was 60 SHP/ton of machinery. The armament was 8-6in/50 and 4-4in/50 QF. There was only 55 tons of protection, so that ship was essentially unarmored. The design speed was 42 knots. I suspect that the actual speed would be much less than that.