This book was broken into multiple sections, held together mostly by the hemp or jute cords. After sewing the sections together and stabilizing the spine, I built up the linings and added new headbands and hinge cloth to replace the disintegrating old ones. Luckily the paper was in good shape, strong and flexible.
The spine is entirely new, a moriki-airplane linen laminate, dyed to match the original brown. I stabilized the corners and sealed them with paste and more moriki, and generally did a lot of work on the corners and edges of the covers. 
Even though the spine was in pieces, I was able to scrape off most of the paper backing and was able to put it back together so that the title is legible. I even surprised myself with how nicely this book turned out.