Have you considered CoreXY mechanics for the XY plane, rathe than lead screws?
You can drive 2 stepper motors connected in series from a single stepper motor driver, although if you do this then you must either increase the power supply voltage or accept a lower top speed.
You can drive 2 stepper motors connected in series from a single stepper motor driver, although if you do this then you must either increase the power supply voltage or accept a lower top speed.