Have you looked at the For Sale section on this forum for parts? Also thebeachcats.com and eBay?
More and more, groups are using FB only and not maintaining a website. It's cheaper and gets better results. You know you can join FB, set your privacy settings way up, don't volunteer any information, and still be able to view pages like that. There are also a few Hobie cat pages on FB that are very good, and a possible source for parts.
I know what you mean about FaceCrack though, I'm currently on hiatus from it due to a combination of a lack of self time control, and mean spiritedness of some of the people (there was some serious nastiness on a Little Free Library page, of all the unlikely places you can imagine!)