Ok I mounted it. I actually drilled the holes with my drill press
Pulled the benchtop and set it on my table saw, hanging over the edge. Pulled my drill press over zapped some holes in the table top. To give you an idea how close these holes are to the edge, when I drilled the 3/4" countersinks, they were literally a hair away from peeking through the front edge.
It worked though and I put 1/2" oak on the faces because I had a piece layin' here that fit.
AND.... I still have access to the drawer that's right below the vise. I thought I'd lose that drawer.