According to a local airport manager, witnesses (local fixed based operator personnel) observed the airplane on the downwind leg of the traffic pattern and noticed the airplane was approximately 50 to 70 feet above the trees. During final approach, the airplane descended well below the normal visual approach path and then touched down on the runway. After touchdown, the airplane began to bounce and porpoise. The airplane then became stable on the landing gear and taxied into the ramp. The witnesses noticed that the airplane's nose wheel was bent forward and after further inspection, it was determined the firewall was bent. The pilot reported the airplane experienced a hard landing.