I posted this vise before (Columbian No. 03 1/2), but now I've made a new mount for it to go with the new workbench.
I didn't want to drill that maple top because I might move the bench and decide I want the vise on the opposite corner, or might have a project that a flat bench top is more useful than a vise. It's a relatively light duty vise anyway, so clamp mount should be fine.
So, here we go. It's made of layered MDF with a piece of cork lining the inside for extra grip. Carriage bolts between the two halves provide the clamping force, and it clamps quite well. I would pull the bench over before I could inadvertently pull the vise mount off the bench.