This level of detail is usually of interest on the 3-rail scale forum. I have a number of Budd cars in different configurations, but was unaware of this one. That really does appear to be a larger letterboard than other Budd cars.
If you really have to have an exact car you could start with a Mac Shops extrusion and remove a corrugation or two above the window area. A lot of work - i did such a thing exactly once, using an end mill.
