Ok well I figured I'd use this foam
I found at joann's, it's about 2" thick and pretty light weight. I'll carve it into two petal shapes for the top and bottom part of the jaw and cover it with a fabric "pillowcase."
I have that much figured out, now I just need to come up with an idea on how to to the base where it would normally connect to mawile's head. I'd really
like some suggestions, please!