I have bought multiple audiobooks at graphicaudiointernational.net, where they mix sounds and music over the books. It makes for a really good experience, if you ask me or my wife! Maybe you can try one of those, to get some ideas on how to approach things, because some audio cues in the background has to be done with a subtle approach.
And while I agree that YouTube per se shouldn't be the media to get it out, I know that *many* people use YouTube for audiobooks, so I think you could definitely use it as a platform. But why limit yourself to one?
