I came across this blog post the other day: http://aflyoverblog.typepad.com/find...29er-pa-2.html It sounds like what you're trying to do. The guy says he bought used parts, and looking over his specs and comparing to his claimed cost, I wonder if he didn't buy some of them in a back alley somewhere.

Anyway, I'd have to say DataJunkie is right. You aren't likely to save money doing this, but it could be fun.