I have just begun to apply clay to the armature here.  If you look closely you will see matches indicating the joints and other points of reference.  The photos on the bulletin board behind me are exported clips from video footage of Casper and Pat Parelli.

In spite of the excellent reference that the photographs gave me, I was handicapped without the actual presence of Casper, the model.  I took the sculpture out to my corral and augmented the flat reference from my own horse, Matt Dillon.  Dillon is a 1/2 Quarter horse the same height as Casper.  There are many differences between them, but Dillon is well muscled and a good backup to my missing model.

Notice at this stage that refinements such as the divisions between the muscle masses are incomplete.  Even though I was comfortable with the foundation of the sculpture, I did not want to go any further until I could work directly from Casper.

I have begun the sculpture of Pat in the same manner that I began Casper.  The armature wires are bent where the joints articulate.  The wire "bones" are covered with clay, paying careful attention to the silhouette and Pat's specific measurements.  As with Casper, I had to use a substitute model for Pat.  A good friend of ours has almost identical measurements and is also an accomplished horseman.