Summary

This is a baseplate for an Arduino-Mega compatible ELEGOO board + prototype board. I don't know if the original MEGA board is 100% compatible.

I use this baseplate for a DCC-EX model railway command-station.

You need 4 x M3 screws. Since space is very low close to the upper 2 screws you have to file the heads of them a little away or just use only 2 screws.
You have to cut 4 x M3 threads to the baseplate.

If youl like to modify the board feel free to do.