If the build quality is as good as the other manifolds on his sight it seems to be about on par with the stuff full-race is doing for the import crowd. You cant touch one of their manifolds for less then 1099, and they sell a lot more then 666 ever will.
750 to me is a decent price for a tubular one off manifold.
I cant wait to take a trip up there and see what he's got so far.