I'll bet you are right about Sutton Farm! I noticed that windmill, too, while I was up on the Wymrock roof knocking off the Steel Watch robots. Well done. Act III did seem unfinished in regard to the hags. In Act II, Ethel had a letter correspondence with another hag in the city. I think those letters were signed "M" or something like that. In Act III we never see "M" ... I'll bet she was up at Sutton Farm!
