Update #2 (I can't seem to edit my posts anymore):

Followed changes outlined in attachment linked to https://bugs.webkit.org/show_bug.cgi?id=70952 and now WOFF fonts *almost* render properly for the example site.
The diffs are against a newer set of files than what comes with 4.8.0, just add the changes manually and it works.

Will post an update if I figure out why 1/3 of the WOFF fonts are not rendering...