I haven't grown or dried any bud as of now, but if you really want to do it outside, you could probably build a wooden box-type thing, caulk the inside to seal it, put a lock or something on the door to it. It could easily be made bug-proof by using some sort of one sided sticky foam seal around where the door is. cover it with a tarp or something after that, just a little added security from the rain, or make a tent kind of thing with it. cut a hole in both sides, not too big i guess, cover them with a very very fine mesh and caulk around it to prevent bugs, and you got some airflow going through. as i said, i've never tried this, but its worth a shot and it's the easiest thing i can think of. if anyone else has any corrections to it, im sure theyll say something.