Re: shaft drive
The concept is interesting however I would be skeptical of the shaft drive you picture here. It is designed for a pedal powered bicycle and the gears, bearings and shaft might not be up to the task of delivering power from a motor. Keep us posted if you try this. A successful shaft driven bike would eliminate a lot of problems associated with the drive chain/sprockets, tensioner, etc. It's old technology, been around a long time and it could be made to work. Use your imagination and good luck.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"