[oXygen-user] advice on epub scenario customization

I am creating an ebook in epub, MOBI and PDF formats from TEI XML. I want to use the built-in transformation scenario in oxygen to create the epub file. But I want to be able to customize the output too. I have seen that the following files are drawn on in the scenario: /Applications/oxygen/frameworks/tei/xml/tei/stylesheet/tei.css /Applications/oxygen/frameworks/tei/xml/tei/stylesheet/epub/tei-to-epub.xsl /Applications/oxygen/frameworks/tei/xml/tei/stylesheet/profiles/default/epub/to.xsl I’ve tested modifying at least one of them to alter the output, which seemed to work. I’m looking for any advice on other files to modify in the process, or possibly other approaches on generating ebooks from TEI XML. Thanks, Andrew