Double Sonoff Touch housing 72mm

I wanted to replace my common light switches with Sonoff Touch. Unfortunately the Sonoff Touch EU are too big to place them into a german double-flush-mounted box. So I decided to create a new in-wall-housing for two Sonoff Touch which is compatible to a typical german installation.

The Thing consists of three parts: The in-wall-housing, a tile and a cover.
The housing contains the high voltage part of the Sonoff Touch. The tile will be clipped onto the housing, thereupon the low-voltage pa