I know, mistakes were made, but I think more recent changes better reflect this.

The issue was mainly that I was unusure if I need to pytagorize and fully connect every exit/entry (it is an open floor plan on level 0)
Another issue was that the editor I used has apparently some rounding errors or something else going on which I need to investigate. map per gave me some tips about not having the indoor rooms and outdoor things at the same place and instead separate them by a few cm.

See 
https://openlevelup.net/?l=0#21/48.26686/11.67011 for more recent results