Ok... Engineer here.... granted this article is from 2006, and I don't generally work with things like this, but are you telling me ordinary humans have found a way to make 2 micron holes?
http://www.zdnet.com/article/the-worlds-smallest-drilled-hole/ (this was a 22 micron hole back in 2006...
I recently procured a smoker trailer and have made some good food... however, vending at an event is a totally different set of Health Dept rules.
If you want to sign up over on the www.bbq-bretheren.com I'm sure that some of the Georgia locals would chime in.
If the tree is within reach of your house... I'd say insurance is a requirement! I wish I knew someone up there- midstate, I know a couple companies that have bid jobs for me within $50 of each other.