This book has reached its recipient, so I can share pictures now! This is Deadset by @pbaintthetb, an amazing Nie Huaisang fic in which Nie Huaisang is murdered and becomes a tgcf-style ghost.
I did a kintsugi-look binding for a different calamity au (ironically, one in which Jin Guangyao was the ghost) but spoilers, this was the fic that I first thought of using it for. And while my first attempt was just a surface design on the cover, I built this into the structure of the book itself. The cover structure is inspired by Ben Elbel's "pixel binding" which is a book cover made of many tiny squares; using irregular pieces here makes it not quite as flexible, but I'm still very happy with the effect.
The individual sections of the cover were glued to a thin, flexible paper, then covered with a decorative paper that I worked down into the spaces between (definitely use paste rather than pva for this). The gold is deco foil, often called toner-reactive foil but it adheres to dry pva as well, so I simply filled the channels with pva and then applied the foil using the head of a pin to apply pressure (you don't need heat when applying it to pva).
For the rounded spine, I used leather pieces so that I could still have the thickness but they would be flexible enough that I wouldn't have to sacrifice the irregular shapes.
The way Ben Elbel builds his pixel binding books is the textblock is wrapped in a suede cover, basically like a paperback but suede, and then the pixel binding cover is glued to the suede at the spine. I'm not sure that duplicating this construction was necessary here, but it worked out well enough. The suede-covered textblock is an interesting look and feel all by itself actually.
