I'm in the process of designing a quadcopter using a MoteinoMEGA, and decided to make a 3d printable attachment to keep all the wires clean.
Feel free to use it if this helps you. I also have the openjscad.org (CAD modeling for programmers) source files , just ask if you want them.
pictures: http://imgur.com/a/MFdXr
Printable STL is attached
(http://i.imgur.com/TwL4cbX.png)
(http://i.imgur.com/aJT0BPX.jpg)
(http://i.imgur.com/WpAAllr.jpg)