One of the extras and possible only stretch-goal for the Hiagb Book KS would be a separate 32 or so paged sketchbook, detailing work done for Crange's design and any other elements from the comic I did in several different of my personal sketchbooks dating back to at least 2014? Just an extra sketchbook section that I would have included in the original book, if it wasn't already 444 pages long.
Called 'the Horselady Files,' as Crange's canonically full name is Faustus Crange Horselady. Design for the wraparound is based on the file God and the Devil were arguing over and was destroyed by the higher up who came to chew them out.