For the covers I thought to make something simple, using natural leather, not dyed, and to apply only a bit of patina on it in the end. The only decoration that would give it a precious aspect would be a detail of a Byzantine manuscript which I would paint myself on golden leaf.
Preparing the boards, the spine stiffer, mounting them together and cutting out a recessed rectangle shape in the front cover where the painting will later be placed.
Mounting the clasps using "hinges" made of thick wire and covered in leather.
Mounting the clasp into the cover by cutting out the shape to avoid creating a relief on the inside. This is followed by fixing it with epoxi glue (for metal).
Preparing the leather for the covers - paring it at the edges
Tooling the cover
And painting a detail of a bestiary with egg tempera on golden leaf, followed by varnishing.