Delta 3D printer firmware for ULN2003 driver and 28BYJ-48 stepper motor

Hello,

I am looking for somebody who would like to help with firmware modification for 3D delta printer. Currently there are firmwares mostly for NEMA17 and similar steppers with Pololu A4988 driver. I do a construction of 3D printer using the low cost 28BYJ-48 stepper motor with ULN2003 driver. The hardware constuction is already done but now I need to deal with the firmware. The concept is a 3D delta printer (similar to Kossel, Rostock). The printer will be more a toy or working small model of the printer then something with perfect printing results. It should be something like a first possible contact with 3D printing for kids or anybody who would like to play with and can not or does not want to spend big amount of money. There is option to do a small modification of 28BYJ-48 stepper which will be then used with A4988 driver. This allow bigger torque and higher speed. But I would like to make a minimum hardware configuration for the printer. So my goal is to use modified 3D delta printer firmware (for example Marlin available here - https://github.com/jcrocholl/Marlin ). My intention is to use Arduino Mega + ULN2003 driver + 28BYJ-48 stepper.

Would be there somebody able to help with this?

Thanks in advance.