This is a great design, Bob, and it accomplishes everything I would want from a sled - zero clearance, both front and back edges of the sled span the blade, adjustable, a legend that can prevent mistakes, and a stop that once set, is out of the way when the cut is made.
I have a couple suggestions - especially for cutting segments for open segment vessels. If the left fence were thicker, you would be able to cut multiple segments at a time. If I have a row that is 50% one species, and 25% of two other species, I like to take two thicknesses of the one species and one thickness of the other two and cut them as a group and this can be done safely and accurately if they are supported from the rear. When I do this, I take the four thicknesses and put a little thin CA glue at the far end, which makes the four pieces act like a single piece. Flipping them edge-for-edge then becomes simple as opposed to flipping four loose pieces.
The second, and perhaps you've already done this, is make the stop a width that if set at the edge of the kerf would cause the indicator on your fence to point at a zero so that you could use the saw's ruler for setting the width.
Thanks for posting this, Bob.
Lloyd