Custom extension cables for Light Stax?
I have also little soldering experience, but I managed to create custom extension cables:
First: open the cover with a small screw driver:

Remove the PCB by lifting the small notch to open the light block

Then you drill a small hole into the opposite side of the metal plates, insert a small 2-wire cable (~0,25mm) and solder it to the PCB.
The outer ring is Vin and the inner ring is GND.
Then put it together and have fun.