Thanks Rob & Stephen. It is quite a bit of kit but very simple.

Kev mines built from scratch. Think it owes me about £350 but has taken me a year to finish it. I'm just sorting the build log now
You can get a ready made one but it's too short really. Mine is 4.8 meters.
http://www.cameragrip.co.uk/acatalog/hague_sm11_car_suction_mount.html

There is a fair bit of photoshop work cloning out the rig. It looks scary but after a few trys it clicks and gets easier.

sooc by Micky Photography, on Flickr