Visited the fort in July, great place, very interesting and the guides were really good, they gave demonstrations and a history of the fort, it's weaponry and the story of the 100 ton gun. They made the day. there were four guides, dressed in the uniform of the time in the hot midday sun while the public were sat on long benches underneath a canvas, shielding us, demonstrating the weaponry and fighting techniques.
In the cafe, which wasn't expensive, you could sample the soldiers daily rations, amongst other things. There was a small museum attached. The guides were all volunteers and we're slowly raising funds to carry on renovating the fort.
Great day out, very interesting. Would definitely recommend it.