Good progress on Mayflies of the Driftless Region, vellum down, title stamped, doublures in place. Below some images. Half circles are aged wood veneer that will flank the fish-leather slips of all slips. Just didn't have scrap pieces.
Front cover and spine
Cave Paper doublure with "open" joint
Next step, gluing down slips and adding wood veneer to each side of slip to make a half-circle...