Hopefully this may partially answer odysseus1980's questions about the Fijis. For this post we go back in time slightly.
Fiji Class Conversion October 1954
From the beginning of the search for a guided-missile cruiser, the Fiji class was considered as the basis for a conversion. The first proposed 48 Sea Slug missiles, Type 984 radar. Gun armament would be A turret and four twin Bofors 40mm L/70 mounts. This was unstable so the missiles were halved to 24 and the Type 984 replaced by the inferior (but lighter) Type 982/Type 983 combination.
In October 1954, alongside the early GW24-31 series, the final Fiji conversion was studied. Further attempts were made to lighten the ship, although a second Type 901 director was added. The radar fit matched that of the destroyer designs which became the County Class; Type 960 aerial search, Type 277Q height-finding, Type 992 TIR and Type 274 surface search. The gun armament remained at one triple 6in turret and the Bofors were now five twin 40mm Mk5 Bofors with STD directors (the mount aft of the mainmast is on the centreline). The rear superstructure held the 24 Sea Slugs, no armouring scheme is known, perhaps none given the topweight concerns. The design was still flawed, stability was acceptable but now trimmed 3ft 2in by the stern. Following this only new sheet designs were considered. Displacing 10,950 tons deep, the 80,000shp machinery would provide 30.5kts deep and clean. Endurance was 4,900nm at 20kts. Maximum complement was 790 (not at modern standards).
Drawing Note: This drawing is based on an official sketch drawing