This is the back of the NES controller, with added depth for supporting electronics, and a simple box for the receiver. I used this model in my wireless NES controller project, over on my blog.
I use two ATMega328s and a wireless transmitter and receiver to wirelessly communicate between the controller and the NES. Check it out and my other electronics tutorials!
Probably works with other settings just fine, but I'd keep at least 0.2 resolution. I used a low fill for the support material.
I'm not sure if the dimensions of this is correct - I have to convert the model to inches when I go to print it on my printer. For reference, the controller should be about 5 inches long, and the receiver box and lid are about 2" x 2.75".
For those who do not want a hole for the switch, I provided a model without the hole, so that you can make your own.