None of it is cast, all is hammered, welded and forged out of steel. Below is an old mule deer shed he found in the 1980's. The deer's right antler is the old natural shed and the left antler is one he formed from steel to mirror the right.
The left side of the skull, below the steel antler, is a more contemporary rendition and the right side of the skull, below the natural antler, is a more natural version.
Pretty nice mule deer. It would have measured over 32" wide in real life.