I read awhile back someone was intrested in making a Vortex tunnel which got me looking for things I could use if I was to do one and I was shocked how quickly I was able to find everything I needed.
It took a week and a half to build and the storm we had two days before Halloween wasn't nice to the tunnel, we had to rush the day before halloween to repair some broken weilds but I was able to get the tunnel done with the help of my friends and what a big hit it turned out to be at my free haunt. If anyone has the time and the money you have to build one. It cost me about $600 I did get lucky by finding a free motor that turned the tunnel at 5 PRMs from a friend so that could of been a huge price factor. We made the tunnel so it could come apart so it could be stored in a small space.
Besides the cloth, motor, black lights and glow paints I got everything I needed at Rona.
The building pictures
Here's the video It's right before we started taking the tunnel apart.
YouTube - Vortex Tunnel