For those that are using the ABP as HBP, this mount is for you. The rig mounts to the X Carriage of the ABP via the two M3 screws on the front. The mount accepts a 1/4-20 screw to attach to a small camera, Joby GripTight Mount, or GoPro Mount. I've been using this for nearly a month and have been getting some great timelapse images. GoPro time lapse example: http://vimeo.com/79851971

I also reccomend filter adpaters for close focusing with the GoPro:

http://www.thingiverse.com/thing:198429
http://www.thingiverse.com/thing:198407