Hi everyone! I'm a home haunter and I've been doing it in my basement for a couple of years now. I really want to build a vortex tunnel, but I don't have the money or the height in the basement. I thought up a new wa to make 4 rings with two pieces of plywood. Each piece would be cut into a four by four square. Then you just put a point in the middle, set your router at 2 ft. and make a circle. Do this once again on the inside. You know have four complete rings. Now these rings are only 4 ft. in diameter, so i thought it would make the perfect crawling vortex tunnel, and the people would be in an enclosed plexiglass or lexan bridge. So, what does everyone think?