Bill?sent me his photos as I couldn't see them either.
His ingenious jigs just reinforces the fact that if you can hold it - you can cut it!
I don't believe there is an 'ultimate vice', just a vice set up well for the cut you want to make.
Sure every vice needs some extender jaws, and a fixed jaw on the out-feed table helps,?but they don't need to be fancy to work.
Here's a pic of a standard vice cutting an 1/8" (3mm) slit to make a slotted clamp, something most people use a milling machine with a slitting saw to do - there are?2 cuts less than?0.040" (1mm) apart. The extender jaws?are just 2"x3/8" black MS bar and extend right across the gap, something that Mike Cox's?beautifully designed and made ones can't do. Horses for courses.? - jv?