Production of Ducati Bevel Twins spanned 15 years, and nowadays a restored bike with original parts will be worth about double the value of one with the wrong parts/detailing. There have been so many variations over the years that most people have no idea what is correct for a particular model. A would-be buyer's first question is always "how authentic is the bike?", not whether it is beautifully restored.
So this book is a comprehensive guide to authenticity. The content includes colour codes, stripe widths, decal placement, etc. The practical chapters are by necessity broad. For instance, there were five fork types, more than five shock absorber types (many not rebuildable), more than five brake types and ten different frame types. These practical chapters cover little tricks in assembly and offer general advice rather than a detailed workshop manual-type description.