** If you find this useful, please let me know in a comment below **

Measurements:
A faint-light green (grass) backing, with 10 x 10 white 16-pixel squares, inside 51.2 x 51.2 gray squares.
The total area is 8,036 x 8,036 pixels.

This grid is available in 2 flavors:
- A single-layer .JPG, all colors in one image 29 Mb
- 2-layer Photoshop .PSD, green on lower layer 99 Mb

Use this to help you plan out your map! Would it fit?
This grid is scaled to the X.360's editor; I hear Next-gen uses 2x so it may take twice as much memory. People are 0.9 in diameter so they will fit 1 per small square. In this example from ActRaiser 1, the path supports 2 people across, or 1 comfortably.