This bike looks awesome. Great work. I'm working on a similar bike right now, a '79 CM400. I'm turning it into a bobber/chopper style bike. http://motobray.blogspot.ca/
They are buzzy little things with the 2to1 exhaust, but fun. A bit low on torque. Great first build. My favorite part is the disc cover on the rear. Dig the 21 on the front too.