Spiritwalker47 is one of those people who looked at his console and said…why can’t I carry that with me? Instead of just running to the store to buy a Gameboy, he used his considerable talent and 80 hours of his time to turn his N64 into a portable 64 Boy. He documented the build and demonstrates the system in a video.
I guess he decided a Gameboy might be a better solution after all, because he has decided to sell his 64 Boy. He is open to bids, but it looks like he shooting to get about $1000. You can contact him through his video channel to enter a bid.