Protective case for the Hobby King Multiwii Pro flight controller (with ATmega 2560 chip).
Update 1/14/14: I added a case top stl file with cutouts for the S1 and S3 ports.
Update 4/2/15: I finally uploaded my case design for the MTK 3329 GPS module that comes with this. http://www.thingiverse.com/thing:752568
Update 5/30/15: Added a case top stl file with cutouts for all ports (S1, S2, S3, and the two I2C ports). You will have to solder headers to the multiwii board for the S1, S3 and I2C if you want to use them. I also added a 4"x6" pdf file of the pinout names - print this at actual size and cut out/affix them to the case. I used an adhesive sheet cut to 4"x6" for printing.
Screw the Multiwii Pro board into the case bottom with 4 M3x8 bolts & nuts (the hex cutouts in the bottom should capture the nuts). You will have to drill out the bridged holes first. Make sure you orient the case so the USB notch lines up with the USB port on the board.
Then screw the case top onto the case bottom with 12mm #2 screws. Again, you will have to drill out the bridged holes. Make sure the USB notch lines up with the USB port.
Note: There is a "well" in the case top that lines up with the barometric altimeter sensor - you may want to put a piece of open-cell foam or something in the well such that it covers over the sensor when the case is screwed together. The sensor measures static air pressure and is sensitive to moving air - the foam helps in "deadening" any unwanted air motion around the sensor area.
Update 1/14/14: Added case top file with S1 & S3 port cutouts. This is for those of you who want to use these ports for peripheral devices. For my board, I had to solder pin headers to use these. I'm using the S3 port (the one on the right side of the center GPS S2 port) to hook up a Minim OSD. On my multiwii board the "+5V" S3 pin only puts out 4.3V, which is not enough to drive the Minim OSD, so I ended up using +5V from the rx pin.