With a Delta Unifence, the original fence rail extrusion rotates 90 degrees and re-attaches to the head via the same two wing bolts and slide. With the fence extrusion laying flat on it's face, what had been the top of the fence is now laying down and less than 1/4" high. For me, this has been the low fence solution for whenever a low fence has been needed.
But the original Unifence extrusion is not ideal, if you want to attach feather boards or Board Buddy type hold downs, so I also have a fence extrusion that is sold by Peachtree Woodworking, called a "Uni-T-Fence". It is a larger square extrusion that also fits the head of the Unifence like the original fence extrusion, but incorporates T slots, one near the top on the face side, and two on the top, plus a 1/2" thick HDPE rub strip recessed and flush in the face where most boards being cut will slide along the fence. So, two different fence styles that I can swap quickly, when the need for one of these features arises. My Unifence came with my Delta Unisaw, and I was a bit skeptical when I first began using it, but I quickly grew to love using it for it's accuracy and features. I also bought a 16" long Uni-T-Fence to use when cutting off many small parts with the miter gauge and using the short fence as a stop for the repeated cuts. This lets the cut pieces fall free of the blade and on the table as they pass the end of the short fence. Those of you who have never used a Unifence don't know what you are missing.
A few years later I added a Wixey DRO to the Unifence and bought an extra readout strip and extrusion, so I can use the display on either side of the fence and for the full width of the saw table and extensions. I was always looking for a better table saw and fence, nearly my whole adult woodworking life, until 18 years ago when I bought this used Unisaw and Unifence and cleaned them up. I haven't had any interest in another table saw since it arrived. This combination of saw and features has been more accurate and repeatable than any table saw that I've ever owned or operated.
Well, my L fence, although not quite as fancy as the one posted, works well with my Unisaw and Unifence, but it doesn't have the fancy tapered edge, nor does it have the dovetail clamp slots. I've been using the sacrificial fence clamps from Rockler. They have worked OK, but I really like the idea of going with the dovetail clamps. So maybe it's time to rebuild and improve my L fence. I already have several pairs of dovetail clamps, I just haven't upgraded everything to make full use of them yet.
Thanks for the post and design idea,
Charley