Here are (plenty of!) images of my print.
I hadn't realised that the towers should have four sides until after printing all the English ports - but the two thin walls on the models didn't print. My solution was to put a few turns of cling film around the base of each flag pole so it's nice and snug.
Without the thin walls, there were four model i had to edit to get an intact tower (Trinidad, San Juan, Havana and Curacao).
I used 0.16mm layer height and 20% in-fill