One of the kayak fishing sites had a setup like the one you're describing. I think they used the ram-ball connectors for "hinges" on the outriggers. The ram-balls are designed for mounting things like a GPS or a fish-finder but seemed to work well for the outrigger setup.

I looked but couldn't quickly find the article. It's probably been linked to around here before but I don't have it handy. If I find it, I'll let you know.

In the mean time, if nobody else has something, a Google search might turn something up....it's a very do-able solution especially for somebody with your skils.

Or, you could cheat and buy a pre-made set like Hobie offers (nowhere near as much fun as rigging your own I suspect).