I'm contemplating the purchase of an "easy" TaylorCraft restoration project. I have help from an AP/IA. What paper work should I be aware of when looking at these projects? I'm aware of the Air worthiness certificate, registration, title work, etc. but I'm less familiar of the "N" number re-registration requirement. I've read that the N number needs to be frequently registered in order to keep the Airworthiness cert valid? Maybe I have this wrong.......