On a serious note - that's very cool. Imagine the ridiculous amount of torque you would have on the low end. And probably gets 70MPG because it's powering such a light vehicle.
Guilio Carcano, one of Moto Guzzi's earlier designers (responsible for legendary 500cc V8 engine) thought a diesel engine was important to the future of Moto Guzzi. New owners, Aprilia, don't seem to agree as Moto Guzzi is rolling out mostly retro-styled cruisery/standard bikes now. It seems to me that if anyone could pull off a diesel production motorcycle, it's be BMW. But with all the recent VW emission cheating, I don't know if anyone would want to try to enter the diesel market now.
Thanks for sharing that interesting project. Total labor of love by that guy.