@Sakitoshi Awesome! I modified
/opt/retropie/configs/all/autostart.shso it calls
emulationstation --screensize 640 576 --screenoffset 37 79when booting and when reseting ES from the menu, and it's working flawlessly!
IMG_20190701_210343.jpg
(I may tweak the offsets based on the final installation of the display, but it looks awesome already)
Thank you so much both of you!