I have seen workbenches where the bench skirts are dovetailed, such as the purpleheart one below and they're beautiful.
I have also read that when joining skirts with bolts that you should install them in a slot to permit the bolt to slide as the width of the bench changes with the seasons.
I'm aware of using splines to align the two but something needs to hold it all together.
IMG1456_xl.jpg
How was this done to allow for bench width changes due to seasonal humidity shifts?? I would seem that some amount of glue would be used in the joints.