Hi
I want to put my two cents in to help you with information for designing new ships. Here I leave to you about the Spanish armada ship list, however, all of the information, are in spanish, sorry.
http://www.todoababor.es/listado/index.htm
Information about the spanish Frigates:
http://www.todoababor.es/datos_docum/fragata-mercedes.html
Information about the three bridges spanish ships:
http://www.todoababor.es/articulos/nav-tresp.htm
Information about the Caliber cannons in the spanish navy:
http://www.todoababor.es/datos_docum/calibres.htm
Information about the heavy british frigates:
http://www.todoababor.es/datos_docum/frag_brt.htm