Yeah Holey,
I was thinking along the lines of the kdx to keep it "Kawasaki", but the lack of bits (here in OZ and probally the rest of the world) has put me off a bit.
I was thinking of either PE 400 or IT 465, plenty of parts, reliable as, and both have the exhaust port in the right place. (single front downtube)
Marc,
Did you have anything to do with the building of the one you mentioned?