I have the first 3 of the Suzuki guitar method books. There is a lot of great literature in those books, it is a fantastic teaching method.
There's a guitar teacher in Houston who uses the Suzuki method. I've never watched her teach, but I'd love to. I don't believe that she teaches large groups of students, though. I think she only teaches 1 on 1 and I teach large groups of students in a couple of guitar orchestras. I think that I may take a look at that 1st book again.
Music touches the heart, but playing classical guitar can lift your heart and enrich your life.