The book is of very little practical use in this day.
I use it as a 'sanity check'
I say to myself 'how would Nessmuk have done it?'
Comes in very useful when I'm trying to talk myself into buying the latest titanium gizmo that I probably don't need.
Nessmuk himself took some flak from his mates with his custom purchases, but he had a clear requirement and use for the things he had made.
A good lesson for us all I'd say?