Just walk away. The guy is a scamer. He has been doing this for a long time. As a test, give him a deposit, your purchase will be caught in the "it'll ship next week" trap. You will not see your money again and if you are lucky, one day in the distant future you will get some really crappy parts.
By the way, I'm not a fiberglass guy, just trying to spead the word and help you keep you hard earned dollars in your pocket not his.