Outstanding Omega! That progress I would have killed for 30 years ago!
After so many years now I have tried many different routines based on beginners (back 31 years ago or so) and of course many modern advanced workouts that I am not all that sure about because they were put out there by people more advanced than I was. I am not genetically gifted, and like many young people in the 70's I overtrained and ate crappy protein and not enough proper food. I had the drive and enthusiasm, but no guidance. I made nice progress the first few years and stagnated to varying degrees after that. I have managed over the years to play with a few different routines, but I have not seen real life/real time results like you have shown.
I have settled down a bit in my life, the kids are nearly grown, and my enthusiasm is near what it was when I had no 'proper' knowledge at all. I can actually gain and loose weight more easily.. (well gaining is easier) I now understand proper nutrition, better training sense, and I think going back to the basics with some modern ideas, something like the routine you'll have outlined in your book could possibly break my semi-stagnant state. I also have some shoulder issues, but I can develop some work arounds, or maybe you'll have some ideas of your own. That kids delts were awesome.. It's worth a try, and something to look forward to.