This shows the plaster production mould completed, eight internal segments plus the two big sides. Then there are the two parts of the tail mould. I think you can see the flat surface on the rear of the horse, to which to flat inside of the tail will be glued when the waste is cut off.
I have marked the wedge with a pink triangle. If I had to make this mould again, I would take the wedge further up, including a bit of belly. Having such a small free area as this when the wedge is out, makes the removal of the inner front leg segment particularly difficult. It really needs to be able to go backwards as well as down and out.
    We live and learn.

This shows the production mould dried and ready for the first cast. The internal surface of the mould was washed with a weak detergent while still soaking wet. It was dried with the parts separated. Experts say the mould should be strapped together while drying in case the plaster warps but this delays the drying unnecessarily. When completely dry, I dust the internal surface with a very fine talc. This aids the removal of the first cast.

The starboard big side, on the right, will be placed onto the other parts, on the left, and strapped up. The horse-shaped void is then ready to be filled with clay slip.