Hey,
I created this printable 32x32 grid for the use with LED Pixel Panel.IFH6-32x32-16S 5mm pitch.
Remove the original Grid and apply the printed grid for a sharper pixelization. 
Free to use and modify: Smartmatrix pixelmatrix Pixel Grid 32x32 by digitaljunk - Thingiverse
I’am slowly working on an extended version to fit in the IKEA ribba squared frame. The inner frame with the grid will house the IR-Sensor as well.
Suggestions welcome.