So, do you have endstops, or do you always start the machine at one corner? Maybe the accuracy you’re talking about is just the parallel to the axis accuracy? I usually start my machine at the same spot, so if I had this installed at 130,89.6, I could get consistent cuts after a powerdown, after I moved the machine by that X,Y, and reset the 0.
I think that kind of registration is really necessary for doing some of those joints at the end of boards.
Also, this would be very useful for the low rider, since the carriage is very wide, and close to the same height as the bit, clamps that are above the workpiece are in danger. I currently clamp a lot with screws, but having it clamped from the side would be awesome. You could also put a backer board, smaller than the work piece, if the work piece was 1/4" thick or something.
I saw a video of Adam Savage touring the Artisan’s Asylum, and they have a nail gun that shoots plastic nails. That would make quick work of clamping for the Low Rider: