Phew! You have just asked for about 20 pages of info in one long, long, sentence. My advice would be to search this board for similar threads, read a few books, (How to build Fiberglass Hot Rods .., by Tex Smith is a good one) and come back and ask more specific questions when you know a bit more about what you want to do. Lots of info on this board.
BTW I think its a great idea to build a roadster -- I am doing it and using ALL of the methods you mentioned.