Here's the progress so far with the guestbook. So far. So good.
I have had to make the back cover twice though. I measured but wasn't convinced my measurements were correct. After gluing, I realized I was initially correct and it ultimately wasn't recoverable at that point. Thankfully, I had enough supplies leftover to redo.
Next up, printing the internal pages front and back and drilling holes to weave the ribbon through. I'm nervous about the printing part. Less so about the binding part. Wish me luck!