Hey the book is good enough, although certain steps could have had some more content ( e.g. the arms of the sedge doll ). However... don't be mislead by the fact that the author (Kochanski) said that information on this topic is scattered and dispersed , this was written in 1987. The internet has provided a great amount of new documentation on the making of bush arts. Among them videos where Mors Kochanski himself shows how it's done, most of these can be found on the "Karamat Wilderness Ways" YouTube channel.
So yes it is a good book, but most of the information is also available for free on the internet.