If you’ve got a spare Arduino Mega available, there’s a way to “play around” with GroundControl while you wait 
for the kit…
In the firmware look in the file ‘cnc_cntrl_v1/Config.h’ and uncomment the line
// #define FAKE_SERVO // Uncomment this line to cause the Firmware to mimic
(it becomes:)
#define FAKE_SERVO // Uncomment this line to cause the Firmware to mimic
Upload to the Arduino Mega and you can tell GroundControl which port it’s connected to (quit Arduino first) and it will think there are motors attached to the Arduino. You can ‘drive around’ the screen or run a gcode cut file and watch the virtual router make virtual chips!