This is the basic parts of Duke's Diner. The Cast Resin body I found on line, the base I built out of sheet styrene and the stairs that are from a Walthers kit I had kicking around. I used N Scale Architect brick sheet to wrap the base and stairs.
Here it is with silver paint on the body and brick that is a bit too bright. I covered some of the windows for the "kitchen" area of the diner. I do need to remove the cross piece in the front left window to match the prototype. I do need make the sign for the roof and add glass.
Here is the real on in 1958.