I dont know if this has been tried before, sorry for asking if it has, but would it be at all possible/a good idea to make a Lego n64 case. I dont want to make anything portable, just would it be possible?

If you can do it right.
When I was making my PS2p, I also took apart my big PS2, realizing I didn't need to I built it a lego case until I bought a neW ONE.
So yes it is particle, but is this because you dont want to make a N64p?

Well...I dont have the screen, or access to a screen, or family support? I dont know.

There's this:

http://www.flickr.com/photos/thelionblog/2322624830/


Also, I have a screen for sale