chrisN, I remember meeting Frank Costin a few times in the early 80s when he lived in Ireland. He had built his own house, very innovative and interesting wooden roof structure and also built a basic glider he called the Scud 2. I think that the Scud 1 must have been one that he had built in the dim and distant past.
For those of you too young to know, Frank Costin had worked for years od wooden aircraft structure at de Havilland including the Mosquito and the Vampire nacelle. Later he moved to cars like the original Marcos and did a lot of aerodynamic work on race cars. A great character.