I have created a first version of an enclosure for the Edison Breakout board. The dimensions are just 64 x 33 x 11 mm. The default pins for power and LiPo battery are exposed as well as both micro USB ports. Four holder pins keep the board fixed in the bottom enclosure. There are also two labels on the bottom to inform about the the power and serial ports as well as a piece that can be easily broken off to access the GPIO ports.
Its not perfect yet but protects the Edison quite well for my intended purposes. I have 3D printed them with a Dimension Elite 3D printer with a layer precision of 0.17 mm.
And this is how it looks like printed:
Feel free to suggest any improvements. I'm happy to incorporate them.