Congratulations !
That's a really great project

. I love what you've done there. Must feel really cool to walk around like that
I think the biggest problem with all these approaches on virtual realities is still the fact that walking around in the virtual environment very often doesn't conform to the movement in the real environment. Means: You'll walk against walls.
I've seen some funny devices which take care of this problem, but they're all in it's infancy.
This is one of my favorites:
This one's also a crazy thing, but poorly useable imo (telling from the vid):
http://www.youtube.com/watch?v=EvkubXHilk0
But hey: it works.
I hope you'll stay involved in VR-research.
Great stuff !
bleach->aneurysm->straledm5->dieselpower->space-fun->o-fun->runningman->runningman1on1->aggressor(conversion)->soylent->bloodprison->bluesky->ruiner->reslimed->strength