Hey Robert, hey @OnefinityCNC, hey all,
If the customers pay a certain amount for an upgrade to one X-50 rail, which is one package, then I assume that those who want an upgrade consisting of two Y-50 rails would be willing pay the double for the logistics since it would be two packages.
For a complete machine, I received three packages, one for X axis, one for left Y axis and one for right Y axis (QCW frame package not counted).