box for flush-mounted box / Elektronikgehäuse für Unterputzdose

Elektronikgehäuse für UP-Dose.

**Watch out!** There seems to be problems with the customizer and the OpenSCAD model. While OpenSCAD (tested with V2017.04.18) renders it correctly (see STL file), the customizer seems to be doing something wrong (see rendered OpenSCAD file or remixes).

**Update 20180923:**
More configuration options.
* Wall thickness
* Plate height
* Lid height
* Box height

are configurable now.


**Update 20180913:**
You can now select the type of the mounting h