I'm certain that this rig was used by ace film camerman, the late John Jordan (had Battle of Britain and Catch 22 to his credit), and was used in the James Bond film starring George Lazenby. He earlier lost a leg when a Bell 47 got too close filming You Only Live Twice (the Little Nellie sequence - using this same rig?) and died after he fell out of the back of a B-25 filming Catch 22.
Not the John Jordan who used to terrorise the airshow circuit in a Stearman by the way!