Niels,
You are doing a fantastic job on her as usual and thanks for posting your progress. I am always impressed with your models and it inspires me to try thinking In terms of scratch built parts and opening closed gun ports, etc..... I have the English Man O' War in my stash as well as the Imai Spanish Galleon and the larger Revell Mayflower that I have been thinking how I could open up those ports, so thanks!
Where did you find that picture you are basing your build on as well as the cannon you are using, where are they from?
Steve