I came upon this: http://www.mm-company.com/ while browsing the vast space that is the internet. Although I would most definitely need a very sturdy leak-proof bag after a spin, this could be an interesting gadget to play with.
Combine this with a centrifuge to be able to additionaly simulate more G. High acceleration and sudden stops may be problems hard to solve. Still no 0G simulation...
The birdsnest of cables that this would make of my HOTAS would make me cryFeasibly to integrate though, just socket on the chair itself - I see they're using wireless in the video.
EDIT: Needs somewhere to mount the IR camera for headtracking too - would need to be attached to the chair.