Come on guys, don't you realize that you are talking about different
things. If you read carefully what Han-Wen said 28-June, there are two
types of generated .eps files when you have an explicit \book{..} in a
lilypond-book score:
I) Page by page files lily-xxx-1.eps ... lily-xxx-N.eps
II) A single file lily-xxx.eps that contains the full score
Clearly, Graham keeps asking about the I) files, whereas Han-Wen keeps
answering about II) file!
Since only the I) files are used when you run lilypond-book on a LaTeX
file, Graham's concerns are completely valid, namely that the height of
each lily-xxx-n.eps file is taken from the default settings in
ly/paper-defaults.ly, not from the page layout of the LaTeX document.