The first clay model has been replicated using Rapidset mortar, and I am quite pleased (that it was not a disaster 🙂 Now I have the second mold filled with the same material.  I will need to remake half the mother mold for the first figure, as I broke it while releasing my statuette:  it was much too thin & weak, also I should have divided the piece a bit differently.  I will wait until I release the second mold, then do repairs on both molds as required.