Hmm, yes, maybe. I'm the one who wants things to really sit properly without loose parts, but it was a good idea! I was thinking more about the parquet, that it doesn't become "floating" in the same way if I put some screws through. Also, are there other disadvantages if I keep the floor underneath?
The advantage of wall-mounting the cabinet is that I avoid damaging the floor in case I need to dismantle the cabinet again. Unfortunately, I have terrible walls, concrete that crumbles like biscuits, old house. But I will try to sketch if it's enough to secure in the walls and ceiling, I think it is! THANKS FOR THE TIPS!