I deliberately delayed this until the estate car (a BMW 545i, series „E61“, also running on LPG) arrived.
As my Gorilla Pod rip-off was torn apart by my son I salvaged the camera mount. The wood was lying around anyway. With a bit of luck (and a slit at the right position) you can drill a press fit tight enough to drive around – if you fail, you can still use some J-B Weld. 😉
In contrast to the full scale „comfort seats“ at the front the headrests at the back could be pulled out to mount this.
Did it work? Well… it is a bit shaky, as you can see here (ADAC driver training):
Just for comparison: this was filmed with a Transcend Drivepro 200 in the successor.
(Original post: http://www.metalforum-owl.de/viewtopic.php?f=21&t=138&start=80, June 1st 2011)