I recently mentioned the Accordion books we made. In the post I mention templates but I didn’t give the links. Here are the links! These are set up for A4 paper and I have them for English, Hebrew and German. Basically you fold them in half for two stories. One side only has two panels for a story because you are meant to glue the other two (as labeled) to the front and back of a piece of cardboard. On the back, before gluing down the story, add your favorite string to tie the book closed.
Would love to see how you use them if you use them.