Just for the heck of it, I took a book from the Patricia Clark Memorial Library here, converted it to text using calibre (and marked up with markdown), then reconverted to ePub (via calibre). Then I took about 10 minutes to head through that newly converted book, changed the calibre created CSS style sheet to element level CSS, removed all the id=".calibre" from the (x)HTML files, inserted Sigil chapter breaks and split the book into chapters, and finally renamed all the (x)HTML files to reflect their contents.
Here's the resulting book.
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