You are an auto mechanic by profession and own an airplane that is certified under a standard category airworthiness certificate. you desire to install an auxiliary fuel tank in the aircraft to enable you to fly nonstop to visit your kids at college, but were stunned by your fbo's quoted price to obtain a certified tank and install it for you under an faa form 337. you have a fuel tank that's the right size, although it isn't faa certified, and you know enough about fuel systems to install it and make it work. what are the possible legal consequences if you succeed?