What a menagerie of changes!

Changed the \dropcap definition to have three arguments, the first and
new one being the number of lines it should cross.

Modified the TOC to “Bringhurst” style from the EOT (Elements of
Typography v4.0)

Re-enabled the grid package with the same specifications but but loaded
before all the sectsty style modifications. This seems to fix the
breaking of all the styles incorporated into the document.
Unfortunately, now I’m getting a number of orphans on pages, pages with
an equation, table or figure seem to be one line short when looking at
the line grid across facing pages, sideways tables are pushed to the
extreme of the page, rather than centring, so I disabled it again.

General neatness.