I finally got around to looking at this. It's a great effort, thanks. I do have a few problems with the map, however:

1) Since the Great Hall also serves as the dining area, there needs to be easy access from the Kitchen to the Great Hall. I.e. there should be an entrance to the Gallery from the Great Hall.

2) Dr. Sieger, Vern Hendrick, and Pierrson all have their own rooms. Particularly, you need to indicate Dr. Sieger's room, since there are clues there. Obviously, these three rooms will be slightly larger than the ones for the rest of the staff.

I also agree with enoto. I don't think those are "covered walkways" as you suppose. I think those are part of the house itself.

When I ran it, I had Piersson, Hendricks, the Doctor, and all other notables living in a detached dorm house just along the walkway near the Great Hall. Entering the lodge, one would either go right to the Great Hall or left to the outbuilding.