That's the thread from my buddy Luc who's still making a bunch of homemade foils:
www.seabreeze.com.au/forums/Kitesurfing/General/DIY-hydrofoil-with-rubbish-and-an-angle-grinder/ He's getting his masts from there. He told me he's ordering a few at the time so it's cheaper with shipping.
http://www.thekitefoil.com/#!e-shop/cre6/!/Special-deals/c/12622627/offset=0&sort=normal Lately he's been making new wings using old Race fins put together and I must say they work pretty well, the foils are fast and stable. You'll never get the performance of a high-end carbon foil, but for recreational foiling it does the trick pretty well.
I hope you have the right tools and skills, there's a lot of trial and error involved
Christian