I created a second pen loop by sewing together the the spare bands that were already there. Might have to think of something else for the ruler when I get to like the last third or so, but for now I’m really pleased with having everything in place like this.
That looks great and such a clever idea with the loop!
As for the ruler, maybe you could make a cutout from a piece of cardboard of the same thickness that the ruler fits into so that the page is flat for writing?