A more or less generic Aristo-heavyweight baggage car was modified to a Sante Fe prototype:
All-steel baggage-mail combine #2024-2038 of 1927, with Pullman-style trucks.
Main spotting feature of most (later) SF heavyweights is the lower channel side sill (simulated by a L-shaped profile fabricated from stayrol strips and attached to the car's floor.
Trucks were moved to prototypical position towards the end of the car. Doors' and body's windows were modified to resemble the protoype. Underboy details were added (e.g. steam traps, generator)
Lettering and paint touch-ups are on the to-do list.