Bill Tindall, E.Tn.
Now that is the level of sophistication I would be willing to copy.

1 what are the holes above and below the threaded rod for?
2. Why is the back jaw higher than the front jaw?
3. Most critically, on the rail being used to transfer the tails, will you describe construction of the "jig" used to support the end of the rail away from the vise, in particular the complex assembly below the tee block......