After feedback (thanks so much!), I've updated the legal analysis for minors as angels on #39c3 with the rules regarding work times during school vacation, as well as a discussion of the GmbH vs. e.V. situation.

Also, here's the implementation plan for the Engelsystem: https://github.com/andreasdotorg/engelsystem/blob/ela/doc/legal/minor-volunteer-implementation-plan.md