First and foremost, that is an awesome bench Randy!
Second, re: traditional l-shaped tail vises per Al's request… My experience is very limited with workbenches period (three years) and with traditional benches especially (about 8 months). While I was building the roubo cabinet, I had a traditional cabinetmaker's bench in my shop space along with the roubo. Actually, part of the motivation for buiding the roubo cabinet was to get the tools out of the traditional bench and get that bench out of the workspace. Why? The roubo did more, I felt.
I bought the traditional bench at auction, and was in love with the idea of having a l-shaped tail vise in the shop. I mean, a vise that opens to the front of the benchtop just has to be useful, right? Uhm… no. Not for me. Stuff that I wanted to work for dovetails had stress placed on it 'front to back,' as in sawing, so the vise was of little use. In the case of tenon cuts, I used the wood-screw face vise and pitched the work at an angle to cut. Even then, the guide rails of the face vise worked against me, limiting the amount of clamping area available to hold the piece.
Working the long edges of boards wasn't very much fun either, on the traditional bench. Actually, I couldn't do it at all. No sliding deadman, no way to hold the long piece across the front while it was clamped in the face vise. (Again, little clamping area because of said guide rails there, too.)
So once I had dog holes across the front-ish edge of my roubo, it proved to be all the bench I could ask for. Loved the idea of the face vise and l-shaped tail, but I kept turning to the roubo to get work done.
My experience is very limited, again, and there are LJs that would (will?) blow these comments out of the water based on many more years of insight. And they're welcome to. But it's what occurs to me and it's shared for consideration. More than anything, though, is not to deny yourself what you want in a workbench. Because it can always be changed / adapted / rebuilt with what you learn and how your work habits change over time…
That is all.