Chritopher, since you have a knack for unerring facts, maybe you can help me.
Years ago, I saw a special about Frankenstein, and at one point it discussed Jack Pierce and his iconic make-up design. As part of that presentation, Illustrations (I assume Pierce himself may have drawn) were shown of various rejected concepts, including one that was considerably "robotic". There were at least three, but there may have been more.
So far, I have not yet stumbled across those images during my internet browsing. I'm hoping maybe you have seen (or better yet, have) copies of these declined concepts. I would love to have them for my personal digital collection.