Actually, my feeling is that a lot of what is done in a class B is similar to 50's styling. The rounded cabinet corners, for instance are used in a number of Sprinter models--for safety, I presume, but the "look" is the same. The "diner" formica might look good if you were going to upgrade an older rig, but I think the general buying public would not like that look in a new class B. A lot of stainless is used in both modern Class Bs and 50's kitchens. Weren't the cabinets in the 50's often enamalized metal. I don't think that would fly in a motorhome because it "would fly"
in an accident.
There is a lot of stainless in the modern Airstream travel trailers, and a lot of 50's look to me, too. Quality never goes out of style. Unfortunately, they didn't carry it over very well to the Airstream Interstate.