We wanted to replicate the scene in the movie where the alien breaks out of the belly. However, the amount of work involved was too great and we were unable to realize it even after many attempts.So I ended up backing off and using airtight decorative boxes to make them eject for shock effect.As for materials, for the ALIEN, I'm hoping to make its head out of cardboard and then color it. But then changed the head to an alien hatchling and used clay to fill in the rest. Most of the prop packaging is done using cardboard, and wood.This makes it more stable.