Chin up

After mauling my stock Elmore jaw, I've begun the rebuild.  I've secured some styrene plastic to the top portion.  That platform will hold the tongue and teeth. I cut the outer edge to fit the basic contour of the head's upper lip.

The styrene below plugs the opening.  Between the plastic on the top and bottom, I'll insert a yet-to-be-specified space filler.  Then I'll sculpt the chin and bottom lip over that. 

Because I've already fit the jaw in the head so it can swing freely, I'll sculpt the bottom of the chin so it will fit nicely in the neck opening.