Quantity   Component name
1 × Arduino Nano V3 You can find these cheaply with any usb type you want.
1 × Camepad Cable For Sega Genesis 2 Use that title to find the suitable cable. Don't get the NES cable as those have fewer wires. Can be found easily on Aliexpress.
1 × Female Connector Socket Slot for SNES If you get the same one as in the pictures, you can 3d print the enclosure that will fit it.