Hey going further with the setup from the 1st video i also created a video now showcasing how to add handhelds and consoles using retroarch as well as showing where you can get system video's and wheels for free and how they work in attract mode (menuart folder). i took Snes as example but setting up any other system using retroarch is always the same.
In case anyone is interested the video is here
https://youtu.be/8GE-Z32cSHg and goes further where the 1st video ended but it's not really necassary to have followed the 1st video, you can always download attract and skraperui etc manually and then follow the video