@pjft Thanks! I am using 8bitdo FC30s, and in all my searching, somehow never came across that thread. Will look into it! My benchmark was being able to play Mike Tyson's Punchout, although in reality I could never beat that game even when I was a kid :)

@Flavor Yeah I was able to install Raspian Lite with NOOBS and it worked fine. I am building this for a friend and would prefer the RetroPie, so it will just boot into it for him.