These are coming along nicely. The teeny rocketships are all embroidered, and now both sides of the text blocks are sewn together.

I debated hand-sewn seams to anchor the folds, but my hands and schedule said ‘nope’. So my trusty old Elna sewing machine did the work, in about a quarter of the time I’d take by hand. (And much less agony.)
Now for the cedar wood covers.
To get a sense of scale, each of these books folded up will measure around 2.75×1.75×1.5″.