My dad worked as principal designer for Hallcraft (later NuWest) Homes from around 1972 to 1980. During that time, some of the company's most iconic developments were built in the valley.
Unfortunately, in the decade before he took over, Hallcraft had another designer who—IMHO and I'm admittedly biased—came up with some of the ugliest designs the company ever built.
These were generally homes that fell in the upper price range, which might explain their rarity In the various subdivisions. Of course, the other reason might be because they're butt-fugly.
If you're in Phoenix and would like to see these for yourself (why?!) they're in neighborhoods on the southeast and northwest corners of West Bethany Home Road and 43rd Avenue. The area, like most, has gone through ups and downs, and I think it's all in a very depressed mode at the moment.