Two options are possible:

1. Either we use plastic enclosures from manufacturers such as Hammond, Velleman, etc. but we'll still have to laser-cut the holes for the 7-segment display, buttons, power & audio jack, etc. anyway,

2. Or we build our own enclosures, made of laser-cut birchwood!
    

The easier will probably be the second solution, thanks to the wonderful Labomedia (FabLab / HackerSpace in Orleans, France).

Here is how the prototypes currently look like:
 

Laser!