This tab has been open on my browser for literally months, so I’m finally excising it from the bar….
A while back the site HackADay did a teardown of the NES, going through how to take it apart and reassemble it, and going through some of the elements of its assembly. It doesn’t go into a lot of detail, but that lets it be fairly short, at only nine minutes.
NES Hardware Explained (HackADay post, Youtube video)