Where can I find a tutorial for making a portable n64?

So far all my googling has gotten me is just a couple of pictures of the insides of the n64 and stuff you may need for modding them. I'm looking for something like a step by step tutorial (possibly with pictures). I know there different shapes and sizes of portable n64s and I don't care which one it is. I doubt it but if anyone knows where I could buy one, that would be nice. But I am willing to try my best on doing this if someone could supply me with a tutorial.