After seeing these helmets, I'm going to give it a shot. My question is about material.
I work for a printing company that does digital printing as well as screen printing.
We also recently purchased a Kongsberg I-Cut digital router that could be used to
cut pieces I need.

What would be the best size material for the helmet. I have access to material
ranging from .010 .020 .030 .040 .060 3MM and 6MM PVC Foam board. Also
12 point and 24 point cardboard.