So I pushed some stuff around and it seems much better now, thank you for your tips which brought me a step further, AndroidOL!
The only problem seems to be the Saturday lessons, where one lesson is held during the time slot of a longer class.
When accessing the timetable for the respective teachers, it looks like this:
Where the shorter class description always covers up the longer classes, even if I look on the timetable of the respective teacher.
This problem has been brought up some time ago, but unfortunately without any clear solution: timetable for Overlapping Lessons
…I’m so close to get this working!
P.s.:
@ross It seems I didn’t understand this part. Any possibility to help me out, please?