Great build, MGD. I'm a big fan of the NT650, I put a few miles on one a while back and really enjoyed it a bunch. I don't know if any of the parts are compatable, but the 800cc engine that's in the PC800 Pacific Coast sure looks a bunch like this one, once you get all the plastic body work off. It may be worth looking into the chances of switching to the top end from that lump. The PC800 may not be the sexiest bike ever designed but the things had lots of go and would run and run and run with nothing more than basic maintenance.