Turning my notes into a draft took a month and then my first swing at production turned out to whiff. I'd been planning to engrave oiled leather then inlay canvas to make the various designs with some sturdy layering. Once I got to it though I quickly realized that once it was cut the canvas wasn't stable enough to inlay. It would deform or fray or generally not be up to snuff.
For all that the result is pretty grand. The bag has a nice feel and heft to it. It holds its shape pretty well but it's flexible enough to swish if pushed. And it perfectly fits the core books and a little extra. I have a few tweaks I'd like to make but it came out so well I've already added it to the shop!