Crazy guy and his machine

Wired has posted an article about a guy named Brian Walker and his quest to shoot himself 20 miles into the air with a giant crossbow mounted on a pickup truck. He plans to stretch a carbon-fiber bowstring 24 feet along a rail, fire up a jet turbine with 1,350 pounds of thrust, hit a trigger, and pull 10 gs as his craft shoots to the stratosphere. You can read more of the details here. I wonder what insurance company insures a stunt like this...