We are the (nervous) brand new owners of a 1971 Gulfstar 36 Motor Sailer. We have lots of work ahead of us and need some help! Does anyone know what the keel is constructed of (what is under the fiberglass coating)? Found some damage to the bottom of the keel and not sure how to proceed. Also, has anyone ever removed the fuel tanks and replaced them? Thanks to anyone that can help us with information!