Once the nose piece was in place, I stuffed the entire thing full of wadded grocery bags and put a few pieces of tape across the chin area to keep the whole thing in a solid, head shape.

At this point I had to just sculpt till I had results I could live with. I used wadded newspaper wrapped in masking tape to get the shapes I needed, and then taped them on. Using a snap-blade style utility knife with a sharp blade fully extended, I trimmed off extra bulk as needed.

I had to put about a six-inch slice in the back of the mask to get it on and off.

The antennae were made of cardboard with newspaper on the inside to add bulk.