Hello, I recently bought a Kitfox fuselage and wings from somebody that had them in a barn for years. The owner doesn't know anything about them and I cannot find a serial number. My plan is to build/buy the rest of the parts to complete the aircraft. My question is, how am I going to be able to register/get an airworthiness cert without a bill of sale from the owner/kit manufacturer or a serial number. I tried contacting the fisdo office but never got to talk to anyone that could answer me. Thanks