This book is starting to show its age, and honestly, that's the main reason it only gets 4 stars. It wouldn't take too much to update the book with color photos/diagrams, a slightly modernized tool list and methods using those tools (e.g. Dremel), etc.
It's worth mentioning that this book will not turn you into a master luthier. The book is meant to teach the fundamentals of guitar building, and it does so by walking the reader through the build process of one steel string guitar and one classical guitar. It exclusively uses the traditional and time-tested method employed by the author. If your goal is to build world class instruments you owe it to yourself to explore additional methods, and you will need to spend time studying with experienced luthiers.