The Rob Adams article in Culotta's Prototype Railroad Modeling book includes Arnt Gerritsen's drawings of one of the AA 74000-series cars. A photo of the actual car Arnt and I measured is attached. While this is a taller car than the one Robert K is modeling, it has the same Hutchins end with an extra panel added at the top.
Sadly our requests to arrange to move/preserve the car once the city DPW was done with it were ignored and the location is now a vacant lot.