Do you mind a few suggestions for improvements?
1. Suppress the automatic generation of the title page and do it manually. What you've got at the moment is first a cover picture page (that's fine), then a page saying "Stevenson Robert Louis" with "Treasure Island" below it (doesn't look very good!) and then, on the next page "by Robert Louis Stevenson". If you suppress the automatic title page generation in BD you can do the whole thing yourself.
2. There's a map of "Treasure Island" at the start of the book, but it's very small. Make it significantly bigger, if possible.
3. On many - all? - the chapters you've got the chapter title repeated at the start of the text. Eg:
26: ISRAEL HANDS
Israel Hands THE wind....
The chapter should start "THE wind...".
That's all I spotted with a quick look. If you could make those changes, I think it would make the whole thing look a lot better.