Sadly the mega file got deleted. However since i downloaded it i might try to put it back online As warellis said the CG and sprite are on exhentai. 4chan managed to identify all the servants after seeing them thanks to the sprites filenames.
No idea if there will be a book 2 but maybe since a few servants weren't in the mats.
Edit : here are the mats (even if i expect them to be deleted again) : ******************folder/LFkzAbQZ#36pXTHzZWapfVAnmifVLeA