Is usually normal to see that most of the structures in-game are made using the normal and old style with old measurements, and sometimes this doesn’t allow us to use all the space we got to decorate or even to make spaces with a realistic scale, so my suggestion is to create a new (or custom) Slot entity for prefab that allows us to make custom sized doors.
For this case I though that a new door size like this photo would be something useful for mapping and optimize some room spaces.
