This is a modification of this thing:
http://www.thingiverse.com/thing:685074

The GPIO opening is big enough to insert a 40 pin connector cable, and if you don't want to use the GPIO pins, then you can insert the IO Cover on top of the pins to cover them.

You will have to print with support because of the opening for GPIO and camera cable.

I also uploaded the sketchup files.

Please get the other parts from the original thing (link above)