I recently updated the runcam2 gimbal for my quadcopter design.
To see the previous design, check here http://diydrones.com/profiles/blogs/mantis280-3d-printed-folding-drone-with-gimbal-in-test
Gimbal mount is compatible with GoPro's slide in and click mount.
Total weight including runcam2 cam is about 150g without battery.
Check out this video
I will continue upload some aerial video footage next time.