Here's what it sort of looks in the inside. The controller USB ports and the power port switched places when I changed to the new USB connectors.
It's pretty much done. I wanted to use some USB SNES controllers just because I needed more buttons to play different systems, but when I updated to the new RetroPi version it's broke the driver or something. So I just ended up using 2 Phillips Recoil controllers. They aren't the best, but they do the job well enough.