It is indeed a wonderful book, and to my great surprise and pleasure very usable by a beginner like I am.
I decided to try both approach, building a maya mesh (in my case in silo, it’s easy to adapt Scott’s instructions since you only need tools you will find in most modeling software) and the zsphere approach and for my first try decided to go with the silo mesh (next one will be with the zsphere model since I do plane on revisiting the book a couple of times 
But I also decided to follow another piece of advice found in the book and the human male from anatomytools.com and received it today with the matching skull. I already had the wallchart and the female anatomy so I knew I wouldn’t be disappointed, but honestly, I was blown away, what a marvelous piece of art. I have no doubt it will help me tremendously, but seeing those two amazing sculptures is also a joy for the eyes during the breaks (and a great motivation too). Soon, I will open a thread in the main forum to try and show my progress even if I’m a bit embarrassed to show my beginner stuff, I have heard, the zbrush community is very open minded so it should be fine 
Mr. Spencer, thanks again fro this great book 
Jean-Luc