This is in the ‘No Judgement’ for following reasons:
- I seem to remember that there was something to stop the motors to attempt positions that can’t be achieved due to the physics we aim to know. I can not recall why i have that memory, it could as well be wishful thinking.
- This is run in both clients with ‘Fake Server’ activated in the firmware.
GC allows me to go with the sled above the height of my motors, so does WebControl. - Conspiracy theory.
In alphabetical order:
GC with a height of 2m over the centre of the sheet:
WebControl with the sled 2m over the centre of the sheet:
Regarding point 3, if there is any secret development including helium balloons to lift the sled above the motors, i would like to know. At what point is the direction of the sprockets reversed? 
Kind regards, gero