Just for those interested I have had no problems(other than a small mod to the roll support) with setting up the Famous Hobby BG004 and utilising the full range of the 18-200 powered zoom on our Sony FS700 rig which is mounted in a R44 Helicopter.(they shake and vibrate)
Links to a couple of shoots showing Aerial vision up to 100kts airspeed and hand held....no post stabilising.

http://vimeo.com/user20571737/review/104514685/ae5128dd80

http://vimeo.com/user20571737/review/104221047/22ecd1edfc