I built the Veritas bench just as in the plan. My bench has the twin
screw vise and a front vise as well. You are right, the dog holes on
the skirt arent needed if you have a front vise and board jack.
However, I have found a use for them. Having a number of bench jigs,
such as a regular and miter shooting boards, hold down, bench hook,
miter vise, etc.,- I drill a 3/4" hole at the top of each jig, glue in
a 3/4" x 2" dowel and hang them from the back of the bench.