I have the laser built and got all my PVC, which I have cut to length. I am only planning a tunnel 20 feet long and approximately 8 feet wide with a height of about 6.5 feet. Never having done this sort of thing before so I am hoping it works. Still considering what fog machine to purchase, was probably going to be something along the line of a Chauvet 901, as well as a timer remote. Open to any suggestions you might have. I would love to pull this off this year.