There are some photos of a different project here:
Ultralight G 1 Helicopter : ULTRALIGHT G 1 HELICOPTER A complete G1 It looks like a direct drive from engine(s) to rotor, without any option to adjust cyclic other than shifting your weight around. You would need some sort of clutch/freewheel option to allow autorotation. Mind you, there will not be a lot of energy in that rotor disc anyway and you would also need a collective control to enable you to arrest the downward motion. I'm still not sure how any kind of control is applied to those blades.