When I get my computer, Id love to help you guys.
As for weightlessness, have you thought about filming underwater? Im not sure whether that is within your means, but it would give the floating hair effect, you could then modify the image in post production.
Im pretty keen on all the film stuff, however Im not sure how my online access will be, so just bare with me, Ill try to help as much as possible.
Ill also setup dig.mixnmojo.com to be your official information page for your project if you want. dig.mixnmojo.com/whatever etc.
We can work something out
Trying to get dig.mixnmojo.com back up.