This idea was not original. The idea came from a plan by G. A. Ewen, published in "Machinist's Workshop" in 2002. The above development was done by Pat Delany for the "Open Source Project". Pat also developed a plan for a concrete based lathe, based on ideas from the WWI patent by L. I. Yeomans in 1915, and some of J. V. Romig's ideas, uploaded in a previous post. I have half a dozen files on the development of this lathe for another future post.
So here is George Ewen's project for a very nice, smaller, engine block based, horizontal mill plan. I don't know if this is the original source of this idea, but I have so far not sourced an earlier plan, based on this idea.