The Quad City Challenger II, an unregistered aircraft that was built and owned by the pilot, collided with the ground during final approach to Lufker's Airport in VFR weather. The aircraft was destroyed, and the unlicensed pilot was fatally injured. The owner/pilot was observed earlier that day completing final assembly of the plane. An eyewitness, who was a pilot and distributor of the aircraft (which was sold in kit form to homebuilders), observed the aircraft taxiing before takeoff. He saw the aircraft take off and climb to about 2000 feet, then head south. The aircraft returned for landing about 30 minutes later. The eyewitness observed it on a go-around after an unsuccessful attempt to land. The aircraft reentered the pattern and turned onto final approach. At about 150 feet on final approach, the aircraft pitched nose down and crashed. According to the witness, the engine was operating at a high power setting when the aircraft pitched down and crashed.