Those are all real nice!
FWIW: I've only seen one other wire inlaid loading block, and that was at a Rondy in Springfield, Oregon, many years back.
Yours are every bit as nice as that one was, mainly because that one was a straight 6 hole rectangle that looked a bit bulky to me.
He received a lot of compliments on the inlay, and I'm quite sure it took some time and talent to put it together, but it was just a little bit much for this old man.
Uncle Russ...