Here are some photos of two of the three modular layouts on display at the convention hotel.
Below is a very well done O Scale layout. Rail is handlaid and is code 100 which is pretty small for O Scale.
The following photos are of a rather large HO layout. And yes two of these photos are of a castle. I have never seen a castle on a layout and it is very detailed and well done. In keeping with that theme the next two photos are a country village in England and one of the trains running was a British prototype I believe.