There was a Fort/Battery Wagner map for an unrelased mod I worked on a while back, as some may already have seen. I don't have any screens of the map itself, but an image showing the fort model seems to have survived. The tower is not really accurate though, but the map itself was awesome. The Union troops were to charge across the sand dunes against the fort, in the background at sea there were gunboats and ironclads, providing not always accurate support fire for the attacking force. A waterfilled ditch with fraise/abatis, sharpened sticks was placed in front of the walls. Needless to say, this fort would be a tough position to capture! Here's an image of the fort model:
A cannon that would have been used by the fort's defenders:
