Welcome to this site and congratulations to a 59 Twinfin! (or two) Try to get all shop manuals, an original parts and accesory catalog can also be useful, youtube as you mentioned, common sense and this site. Our friend here from France can really do bodywork (I am jealous about his competence), I am putting together a Bonneville Convertible that I bought as a basket case, and I really know how this cars looks "inside". I live in Sweden just 80 km northeast of Gothenburg, maybe I can look for parts around here. Good Luck, and if you want to travel a bit, you are welcome to our car meets here in Sweden coming summer!