By "finished" I am only referring to the enclosure, not to the evolving (hopefully) software. Once released to the open source community, the software should be, in theory, never "finished", like a piece of art :)
Here is a photo of a simple (and cost-effective), yet elegant, enclosure, consisting in two laser-cut sheets of 1/8" plexiglass separated by plastic spacers.
Gamma-photon radiation detector
28 minutes ago