Cool homebrew mount. I would recommend a third attachment point to really cut down on vibration. I would also be careful how far from the car you extend it, authorities that spot something hanging out into the other lane might want to speak with you...
I've seen lots of people talk about those microphones. It's a knock-off of a Sony for [less than?] half the price. I've read mixed reviews: some of them sound as good as the Sony, some sound like cheap Chinese knock-off crap. Hopefully the one you get is the former, not the latter.
PS: shame on you for passing on the right.
I was finally able to get my Nurburgring footage to upload successfully. I had to skip the CineForm Studio Protune processing, but at least it's up and viewable.