Being a curious sort, I extracted all the graphics from the director cast files of the game, and made maps of all the rooms in the House.
Which is when things start to get odd, take the grounds of the home:
http://i115.photobucket.com/albums/n...ps/outside.png
it seems the two paths down the side of the house dont quite line up with the spacing of the gates at the rear of the house.
However the ground floor seems to have a lot more problems.
http://i115.photobucket.com/albums/n...roundfloor.png
Most of the roms line up, but the Lobby is much to narrow, and you can see the door to the dining room does not line up correctly. The Scullery also seems to suffer from the same problem of being too narrow.
More of a problem is Mr Herriman's office, which clearly can not exist where it does, as it is too wide to fit in the space where the bathroom is.