I released version 0.2 of Mark Book Builder. You can download it from the Mark Book Builder page on this site.

The big addition in version 0.2 is the ability to add a cover image to your book. Choose Book > Edit Title and Author to open the sheet. I need to find a better menu title.

Click the Choose Cover File button to choose the cover image file. Click the Update Info button to set the book cover to your image.

With version 0.2 you should be able to publish EPUB books for novels and nonfiction books that don’t have images, footnotes, or tables.