I made real first attempt today at making a prop. I have done other simple casting items before, but never have worked from the ground up with a 25 lb block of clay before till today. I did get some help with this via a shell of a original Cylon to help this take form. After that it was the rest me. I pressed the clay into the plastic helmet, and popped it out then started the work. Four hours later the below photos are the result of my time.
Note that the last photo isn't the finished design. I made a slight change before I made the insert.
So thumbs up, or go back and try again?