Will people be able to ask questions about the book contents on the E-book site? I think it would be good(if it is possible) to combine the E-books with the closed Literature
I would suggest not as also noted in this question
This proposal is aimed squarely at issues that relate to using the e-book reader's hardware or software. So if, for example, your e-book wasn't being displayed correctly - then yes, the questions would be on-topic.
This site should be about how to create, read and use ebooks and devices and applications used to read or modify/creat them. It should be independent of the quality or views about the content.