I've been looking at doing the same thing for auto-x use. I'll ditto the backup strap comment. make sure that it's short enough that the camera can't contact the driver. For auto-x or track use, I'd probably rather not have the bar mounted to the driver seat, and I wouldn't want the camera so close to my helmeted head. If I was going to mount on a front seat, I'd use the passenger seat even if the video angle would be further from the driver POV. Ive the bar straddles both front seats, I'd move the camera closer to the passenger side. My plan was to mount it to the rear seat headrest posts.
How did you guys fasten the bar to the posts? I like the speedmount. It looks sturdy and durable and the holes are pre drilled (although it would probably preclude use in a differnt make/model car). Also, if I built one myself, I'd probably go overboard on the ball head...but that wouldn't be such a bad thing
