Jerry,
Thank you. That is what I was looking for.
Some years (decades) ago Frank Ellington was offering prints from copy negatives he had shot of ACF builders views; he was interested in the Santa Fe, but took all sorts of other photos. I purchased the views he had listed of the SV cars. These were interior and exterior views of the completed cars. But no construction type views.
Just over a year ago I was up in the SV country and had an enjoyable evening with one of the resident students of the railroads there. He told me that the cars had the steel underframe. Also he said that some people did not believe that the cars were built with steel underframes.
Brian Norden