"My father was a member of the press who interviewed Walt Disney several times from 1947 on and always managed to bring home little bits and pieces of Disney wonderfulness, particularly after I came into the picture in 1950. Among them was this pencil drawing which we never had properly framed. It was just stored down in our basement and I would take it out and look at it from time to time. It seemed to be some kind of work in progress, but what it actually is, or was, or was supposed to be is still a mystery to me."
Finally the mystery is solved! It was art prepared for magazine articles about the film and probably specifically addressing the similarities to the Tenniel art. I've still not come across this art in a US publication, but it must exist somewhere!