During the landing roll at a 1,000 foot long remote dirt airstrip, the pilot encountered gusting winds that varied in the their direction. While focused on compensating for the unfavorable winds, the pilot failed to slow the airplane sufficiently to ensure that it could be stopped prior to reaching the end of the airstrip. The airplane therefore overran the end of the airstrip, impacted a number of large rocks, and flipped over onto its back. The accident sequence resulted in damage to the top of the vertical stabilizer, and a permanent bend in both of the lift struts on the left side of the airplane.