Here's a lifesized Smilodon skull I made. I referred to a Bone Clone cast to make it. The main parts are sheet copper, the teeth are stainless and it's held together with hand hammered copper tinners rivets. Different metal chisels gave me the seams between 'bones' and the required texture. Liver of Sulphur gave me the patina I wanted. It took me three very intensive days to make. Enjoy.