The first prototypes of this project started with a laptop in the backpack. This had many disadvantages like overheating, weight and a lack of comfort. Also the code was very buggy in the beginning, running into crashes that I couldn't reconstruct.
So I started moving the project to a new platform (Raspi) and overworking the hardware and code. I am now at a much more portable and stable point and I will release more infos and hopefully the code (when I cleaned up my beginner-level writing) very soon.
For now here are some progress photos: