Hey Moff,
Haven't seen it done. Probably this guy is just doing it as a personal hobby. If you go to his profile:
http://www.wayn.com/waynprofile.html?wci=view&member_key=6746172 you can always send him a message and ask him.
Personally I've always wanted to do that James Bond thing where you ski straight off a cliff with a parachute.

Cheers, MG