I spent some time this week looking over some of the other products that came out of the Nature Method Institute in the early 60s. I wrote up a Greek version of what would be a first chapter, which you can download in full here. It's similar to the Ørberg conversion I have done, but a little different.
It's more than a little difficult for me to find more information about what happened to the Nature Method Institute. Do they still exist? Did they cease at some point? What happened to the authors of these materials?
Not promising to do any more in this particular area at the moment, but I may well write more chapters. I am really loathe to promise to complete any of my so-many side projects. They get done if they get done. (Although the next Patristic text is coming along nicely, I can say). The next 3 months are going to get a little crazy, so we'll see.