Thank you for your reply, I really appreciate it
I think your suggestion might be more related to the handbook UI and not my player written book attempt.
It turns out my issue was as simple as not signing the book, which I went into creative mode to try out.
Unfortunately I'm experiencing a new issue where the final content is being split across pages... I suspect due to automatic pagination when the VTML gets too long for a single page.
I've attached screenshots of my attempts but they might be out of order, so I labelled them 1 to 6.
Any ideas if there is a way to deal with this somehow?