Actually, my research shows the the Castillo was never fully armed when under the flag of Spain (and, most likely not while in English or American hands) so the demands do not run anywhere close to a full 72 cannon. I do intend this for other purposes and will need many more cannon before I'm finished so if anybody has a line on cheap cannon (or just cannon barrels) please drop a note in the comments.
with the corner towers in place it does look very much more elegant
even this late in the game I find myself a bit overwhelmed by the size of this silliness
28mm cannons look puny
the diminutive size of the Fort Matanzas in comparison