The pilot was departing from a mountain ridgeline, in gusting wind conditions. He said he started the takeoff in what he estimated was a 5-10 knot headwind. At liftoff, a gust of wind raised the right wing and the left wing struck the ground, which pivoted the airplane to the left. The airplane then continued over the ridgeline, downhill, nosing over, and coming to rest inverted. The airplane sustained substantial damage to both wings and the fuselage. There were no reported mechanical problems with the airplane prior to the accident.