I liked jrebeiros design, but had problems with the board mounts snapping off, so I imported the stl into sketchup and edited them :)
I also opened up the vent holes, and added the LED hole.
The holes are made for M2.5x12 screws.
As requested, I have uploaded a different lid, with the text Mini-NES added to it.
Sliced with cura and printed ok.