Sounds lke a great idea. Just don't know how you'd push the fog along efficiently enough with just a fan. I would guess you'd have to have at least (2) foggers on either end. The garage idea is pretty cool. We have a guy in our sub that does that and it always turns out great. He works on it starting in September and builds it during the weeks. You don't have to worry about weather or theft, and you can set up as needed.