What if it was mounted at the top center, same height as the motors? Cuts the length down a lot. Reduces “sag” somewhat due to shorter length of cable, but is pretty vertical when sled is near middle of sheet. Also electronics closer, out of way of sawdust, helps pull sled up, not down or to a side.
With this we can still find any x, y location with shorter cables, more vertical. Still needs a linear sensor with angular measurement.