wcb,
My site is offline for a while because I moved recently, but if you're still interested in the plans just PM me with your email address and I'll send them to you.
It's been discusses a lot on the forums, the Jakks units are definitely not perfect, but they are pretty close, and they don't have any boot-time, and no possibility of messing up the configuration, so they are perfect for some environments. Hacking them is really easy, the circuit board is even labeled (left, right, up, down, fire, etc.).