are those remains of a controlled residential ventilation pipe in the middle of the room?
I rather don't think they are remains, since the ventilation installer only starts on Monday. But it is definitely a controlled residential ventilation pipe.
We have also made progress. All floors are now installed. The toilet area in the bathroom is still missing, which should be completed today. The wet cell will get a bench. Doors are expected to be installed next weekend.
I finally managed to get to the construction site myself again today. It is impressive what the bricklayers have built up in such a short time. Only in one place were they a bit overeager and (hopefully accidentally) bricked up half of the stairwell window. Attached are a few impressions from the inside of the shell construction.