In July 1973 Minifigs announced a line of vacuum formed buildings. While I remember having a vac formed building about that time you had to cut out four walls and a roof and glue them together, so it wasn't a Minifigs one.
They probably don't qualify as being much to do with S Range, but I thought they would make an interesting post. I wonder if any have survived?
The two adverts are from Almark Modelworld magazine, the first the "teaser" from July 1973 and the second the first pictures, from August 1973.