If you are going for a fixed layout, it may be better and much easier to just create the book in LibreOffice Writer (create a page of the correct size and correct margins), and then export to PDF.
PDF is a file format specifically created for fixed layout/printable documents, while EPUB is a format created for reflowable text and media. You CAN create a reflowable PDF, and you CAN create a fixed layout EPUB, but I think it's easier to do it the other way around.
Is there some specific reason you want to use EPUB? One of them could be that you are creating a document for use on a device that does not read PDF.
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