Man, this is so cool. I gotta build one. I think I'll build it on my old CB500T. Enfields are easy because of the separate tranny, but they're too expensive. Of course, I could build it on my YZ490 and have an offroader. I don't ride the '490 anymore because my XR500 is a much better trailbike, and I'm too old to be riding an open-class motocrosser anymore. That bike's a psychopath.
These diesel conversions really do get 180-200 mpg.