Diamondback, what is your preferred method for getting data on the forts to you?

My group played the "Plunder the Town" scenario a while back (with fairly disastrous results for our British squadron and the hanging of our admiral for gross incompetence) and it got me interested in Admiral Vernon's failed attempt to capture Cartagena de los Indias in 1741. I've been researching the campaign with the intent of writing a series of linked scenarios for our group. There appears to be limited data online, but I have located a number of written sources on the defenses of Cartagena including Admiral Vernon's account (a digitized copy with a poorly executed OCR conversion of the text). I have located a map dating from 1741 which shows the layout of the Boca Chica forts and batteries by a Royal engineer assigned to the expedition.

By the way, two of the forts on Hispania Sails website are from Cartagena: San Luis de Boca Chica and Manzanillo.