We experimented with casting appliance in Gelatin using plaster and it turned out to be a very successful. The gelatin works very well on skin and has organic sub-surface scattering properties. Will post pictures of the gelatin soon.
So the next is to build the actual cast for the head and make the gelatin parts. Here you can see the Styrofoam head with the clay added to create the positive for the mold.
The idea is to use a 5' PVC pipe to cast a solid gelatin tube with the bald cap at the base of it. Then apply this appliance over a latex bald cap and then blend the edges with more liquid latex.