I saw a case mod a few months ago where someone took their Wii and put it in an NES case. It was cool, but it hung out the back of the NES, and had too many lights, taking it away from the original look and feel of the NES. So, I decided to make my own Wii/NES. It's called te WiiNES (Wenus). It is a work in progress but all the original buttons and lights are functional and the Wii fits in the case without hanging out the back.
This is an old pic, but it gives you an idea.