Here it is with the groove for the bottom partially cut:
Once I finish with thse bottom grooves I will drill the holdfast holes for the "bird's mouth" batten I use with a stop and a holdfast to secure boards for face planing, taking care of the rest of the big three jobs for a tail vise.
I think for each of these jobs, holdfasts, battens, and stops will do the job as fast or maybe faster than using a tail vise and with little chance of bowing thin stock.
BTW, notice my row of dog holes are slightly more "inboard" than they would be if the bench had a tail vise.
Photos of a face planing set up to follow.