Yeah I've seen the instructions online for building your own flow hood, that whole subculture is pretty nuts. If you haven't read Hamilton Morris's story about the guy who created the Penis Envy psilocybe strain, it's pretty interesting both because of the content but also because it involves a lot of folks you probably know or at least know of if you're into the amateur mycology thing.

http://harpers.org/archive/2013/07/blood-spore/