See Fairwheel on getting Tune parts... they are the US distributor.
Do you have a CNC shop? What are you planning for other features of the hub?
I already checked with fairwheel, and I just got a response today that they have a hard time getting small parts from Tune. Looks like I may just end up doing dt. I don't have a CNC machine, but I have a few good connections with some shops. So I'll just be designing everything except for the freehub body and the ratchet system. Then I'll just send them the solid model and gd&t drawings.
Right now I am really wanting to do a 21h or 24h triplet rear hub. I've always wanted to try out the concept, but there aren't many hubs on the market (pre-manufactured Campy and Ligero wheels). For the rim, I'll just see if someone at Reynolds can custom drill me a set of 32 tubies. The front will be a nice wide flanged hub. I'm a bit of a fatty compared to the rest of the cycling world at 210lbs, so I really like nice stiff wheels that spin up quick. Hopefully I can get them sub 300g for the set, and still have them be extremely durable. I'll be doing j-bend spokes. I've never been a big fan of straight-pull. I feel like the threads and the nipple are a larger source of issues, plus I think I could make a stiffer and possibly lighter hub with j-bends.