here is a head for you. one of the free models on turbosquid.
import obj into rhino, use MESHTONURB command to convert to nurbs surface and mastercam will play nice with you. didnt bother to take time to add eyeballs etc. about 1500 models on turbosquid, more than half under $10, i always try there first if i get stuck.
hmm google facegen as well