Cut the door to size to fit in dirty room.
Apparently there is a door which doesn't fit the opening to the dirty room.
It needs to be cut to size with hinges added so we can close the room.
A first cut was made, and we found out the door is not exactly solid, but hollow, filled with some semi-hard material. Further inspection and discussion amongst people experienced in working with wood and doors and hinges, must be done to determine how to best solve this hurdle. The filler material is not soft, but the weight of the door is also high...