I built a Retropie portable. This isn't a tutorial, but if you'd like to make your own, here is a list of things you need. Everything you need below can be found with a simple amazon search, but it might be better to get some of it from micro center or adafruit. If you need any links, let me know in the comments.
- access to a 3D printer
- Raspberry Pi 3A+
- Cheap battery bank
- backup camera monitor
- 5v - 12v boost converter
- Teensy LC
- Various Buttons and Switches
- Analog Sticks
- Lots of Wires
- a Soldering Iron
This is not a weekend project. This has been a dream of mine for years and took months of planning, and weeks to build. This project is not for a beginner.
Credit to Marble Pawns, EDM Bot, Breakwater, and Cyranek on youtube for the music.