Arduino Mega 2560 Screw LayOut

On the standard arduino drawing for the 2560, The most right bottom screw has no x position drawing. I am creating a file for a laser cutter using a very basic drawing package. Hereis it so far:

That bottom screw I know fits up 2.5mm, but how far across does it go? Thank you all!

Standard image:

That's not "the" or "a" standard drawing. That's a drawing that johngineer made.

For the "official" drawing, look at the EAGLE files.