Soundcore 3 Station with Smartphone Holder

My son's Tonie Box was no longer sufficient for his needs (long audio plays, easily switching between tracks, skipping to certain chapters). We therefore opted for a Bluetooth box, the Anker Soundcore 3 and a n old cell phone, which is automatically set to kiosk mode with the Tasker app so that only the audio player really works. After that, I was looking for a station that combines the Bluetooth box and smartphone in one place. After several attempts, I developed this audio station, which comes with a knob to switch the bluetooth box below on and off, and a cut-out for the charging cable. The part with the smartphone holder can be plugged in for better printablility.

The station is designed rather sturdy with rather thick walls so it should withstand a little drop from time to time. 

I've attached 4 3mf-files: 
The whole station with all parts and the 3 parts if you don't want (or can) print all at once.