more infos will follow... later.
Becky, i can give you rough draft like this:
Minimum 5000 Euro, professional prototyping tools,
a good programmer at hand (erhm, forget this for you...)
and the will to learn a lot and spend more!
otherwise it will just be very disappointing and frustrating.
it took us more than 3 months to get the center of
rotation above the belly, but keep the mechanics
completely underneath - to avoid parasitic forces.
(motion sickness)