If you have the appetite and time, you'll find almost everything you need within HSBBW. What it is it NOT, is laid out perfectly ready to follow to a T. Every recruiting journey is unique/different, so trying to mimic someone else's is usually a recipe for disappointment. You will find things that worked wonders for another kid who is nearly identical to your kid, that don't do a thing for you. So don't chase that ghost. If you put in the time and cast as wide a net as possible (by experimenting with LOTS of approaches), your son's recruiting journey will likely contain small pieces from 100 other previous recruiting journeys.
If that vague/high level advice leaves you unsatisfied, I'll throw one more out there that will likely leave you equally unsatisfied. If you and your son sincerely feel he's doing everything (or more than everyone else) to get bigger, stronger and faster... you're wrong. Go ask any player/parent if their kid is doing more than others to get bigger, stronger and faster and 99%+ won't hesitate - absolutely! Even in a classroom full of straight A students, one of those straight A students is the dumbest of the bunch. If you can't PROVE you're bigger, stronger and faster with tangible/measurable results, you're not bigger, stronger or faster.