Thanks for your kind words!
Unfortunately we don’t give or sell the details of the PCB for the NiryoStepper motors (though you can find overview schematics here on github). For several reasons we only sell Maker Kits as a minimum kit.
If you just want to get some “servo-like” or closed-loop stepper motors, you can search for Mechaduino on Google, or check out closed-loop stepper motors here for example. I guess this is more close to what you need.
Hope this helps!