FWIW: The newest FWW has an article on building a 
"rock-solid bench".

The vices on the bench are a big Emmert as the front vice
and a nice tail vice.  Unfortunately, most of the information
about the Emmert in the article is about how cool it is, with
almost no information about how to mount it.  The bulk of the 
article is about how to build/mount the tail vice; still, a nice 
article (and a nice bench).

Nichael