What is this motion capture stuff you mentioned? Is this a 3-D motion capture system? like the kind they use with 3-D skeletal animation in movies?
I'm curious as to how you managed 1mm of resolution with standard RF frequencies. A tech guy I know said that Doppler techniques couldn't achieve that kind of resolution with standard frequency bands. On a related note, you mentioned that it could be put together by a skilled hobbyist; does that imply you HAVE instructions for the public? Since you've patented it I guess it would be safe to release these to instructibles or something, but I'm not really sure how all that works.
Anyway, I'd love to see the design if it is a 3-D motion capture system, I find that stuff fascinating. I would think if you made a really good AND cheap one you should just move out to hollywood and get to know some special effects guys. The people they work for have government-sized budgets nowadays. Watch the special features on Beowulf, that crap was NOT CHEAP.
Best of luck to you!