Hey, sorry for the late reply. If you still need help, just email me and I´ll try my best to help you out :D My email is: momo.net@web.de
Kind Regards

I bought the claw gantry from http://www.alpha-electronic.de/

Hey, the gantry looks fine, you just have to figure out which voltage is needed to drive the motors. what exactly to you mean with Reverse engineer the connections?