I have heard of Walters (but being in the RustBelt have never seen them). I have seen Lustron Home in person. It was small; very turquoise and much like the Jetsons cartoon. Lustron was a painted/coated steel panel kit home. Really cool to see (a couple of those around here too!)
My Grandchildren have a play house in the back yard which is about the same size as these houses.