While making a localizer approach to Runway 36 in IFR conditions, the airplane broke out of the overcast at about 400 feet agl. The pilot forced the airplane down and landed some 2000 feet past the runways threshold at about 100 to 120 KIAS. The pilot stated that he was unable to stop the airplane before it departed the end of the runway and collided with the airports perimeter fencing. Damage consisted of the right wing, right aileron, right elevator, the nose gear and propeller. There were no mechanical problems reported by the pilot or discovered during the post-accident examination of the airplane.