wow it was logn ago when I wrote last time...
Still, the project is alive... interferred with another project named: refurbishing the house
So, The idea of the power transfer is:
Motor - gearbox - small freewheel (like 16 teeth) - chain 1/8 - big sprocket (BMX pedal sprocket) fixed on a wheelhub which has thread on both sides for freewheel / fixed gear. (stunt bikes and delivery-boys use them... calling the bikes fixie)
so the main "invention" is the new wheel hub which has the thread on both ends. It will allow me to put a normal 3/32 freewheel on the right side to be driven by the pedal, while on the left side there will be a fix threaded sprocket locked with a locknut. (all can be ordered from bike shops for chips) The sprocket I choose has some holes on it for weight reduction. They gonna be perfect to bolt the BMX sprocket on. I could get a wheel hub which takes a disc brake too, but let's face it: this is much cheaper and I can place the sprocket much closer to the wheel... I gonna need it as the frame we not designed top have anything on the left side.
So here we are at the moment, haggling with the internet shop.