This is my final phone. As mentioned, I've used a fishing line to hold the top part in place. This makes the entire phone much stiffer.
https://www.youtube.com/watch?v=pUZs2xNawWE
Keymapping:
Play/Pause = fixed landscape mode
Play Next = enable auto rotate
Play Previous = toggle flashlight
Win (Meta) = ctrl right
# = Shift right
since I used # key for right shift, we have to find a substitute:
Ctrl left + Ö = type text: #
Ctrl left + Ä = type text: '
So far, I'm very happy with it and I fully switched from my Pro1 to the self-assembled phone. Slowly