(Brazilian navy vessels doesn't carry a prefix btw)
...not exactly. It's just that the Brazilian Navy gives their vessels prefixes according to
ship type. Thus, São Paulo would be NAe São Paulo(NAe - Navio Aeródromo, or Aircraft Carrier), while one of the Garcia-class FFs, which were classified as destroyers by the Brazilian Navy, would be, for instance, CT Pará(CT - Contratorpedeiro).
Regarding the drawing, I don't see anything wrong at first glance, although I have a question: Is that a gun mount just forward of the main mast? IIRC, the Type 22s were fitted with a Bofors 40mm L70 in that position in Brazilian service.