Greg Norman enlargement process at Deep in the Heart Art Foundry

The original pattern was scanned into the computer with a laser beam. Once in the computer, a layer is removed to allow for the addition of oil clay and the final scale it set for output. Then the computer drives a milling machine that cuts the armature out of foam at the desired size.
On the computer

Beginning to mill the armature

continuing to mill

put together

Next up; sculpting in oil clay.