coolest one I ever saw waas my uncle built one in his step daughters bar. It was a narrow plywood I think and it ran all around the outside walls up close to the ceiling. IF you have a room you could do that with,,,it would be neat. But he may not be able to handle the stuff. this one was a larger scale one complete with whistle and all. specially if you had a center wall you could tunnel over to other side and back thru the joist spaces up and down with a small grade!!