You should mention that it's a parallel universe, not really "taking place after FSN".
Oh also for material books, there's "Fate/Side Material". It came with the limited edition of FSN. Has some illustrations, sketches, and an encyclopedia of terms/concepts/characters.
There's also those three Fate/Side Materiale ones that can be downloaded off TM's download page (the encyclopedia from Side Material is there too, under "用語辞典")