I am simultaneously delighted that such a thing was built, and in pity/awe/fear of anyone who dared to live in it for a month or more.
(Rumpus room and laundry room? Do we see those on the show or are they concessions to reality? And do we see Maggie's room, or Bart's bathroom?)
Marge and Homer's bedroom closet is hysterical.
I think I would begin to feel I was made of Plasticine if I were in there for long.