[inigma]

My info on "natural spin" comes from Dr. Ning Li formerly of the University of Alabama.

I had meant to say that "adding too much mass too quickly would obviously cause Ceres to spin down and the weakened gravity well would essentially allow Ceres to spin itself apart".

This was also with the assumption that rockets were being added to the surface, with enough mass to spin Ceres. That mass would cause Ceres to slow down its spin, destabilizing its gravity well, and the rockets would attempt to spin Ceres in that destabilized condition.