It might not be a bad idea to link to the Fate SRD from the .pdf, if that's legally viable. I think it really depends on what your market looks like; the Fate rules are pretty easy to get a hold of, and if the people who'll be buying your book already have them on hand, it might be extraneous.
On the other hand, I know that the Hero System people found all-in-one books to be way more popular for them. I don't really know what people want off the top of my head.
But! If you want to put together a survey to send to backers, I'd be happy to help out or just do that for you; My masters' thesis is done, and I've got the time to do it now.
Iron Edda was wicked sweet, and more is definitely something I wanna see.