update on post above with pics
Thanks Greybeard,
Looks like a solid little drive, my original thought was to design a shaft-in-shaft crankset so I could do a left hand drive. However that would require welding a new piece of bottom metal to the frame so as to use ball-bearings instead of sleeves.
I talked to Max-Torque clutches today and will probably use a direct pulley or Lovejoy connection as I originally intended. James is a really nice guy and is willing to build custom setups for new drive setups.