I started this out after watching and reading HowChoo’s tutorial 9846926473987 times.
Another more recent build
Things you need
3.8mm + 4.5mm + trigram triwing Security Screwdriver Bit Tool Set (To open the cartridge)
Blank NES Cartridge or One from your collection
How to install
Once you have all of your parts. You will need RetroPie. Go to the Retro Pie Download Page and since this tutorial is for Raspberry Pi Zero, download the Image for 0/1
Once you have the image, you will need software to get it onto your SD card.
Etcher is the best for Windows, OS X, Linux
Etcher is very easy to use. Here is a video:
Once you have this on your SD Card, you can place it in your pi, plug in all of your cables. and test out the setup. You should boot into RetroPie but with no games available. Here is how you install ROMS from a USB thumb drive.
How to customize
ROM Box art scraping:
How to package
Here are the pictures. Every time I open up the cart, the wires go back in minutely different places.
So there it is. Please let me know if you have any questions and I will try to help or point you in the right direction.