1937 Studebaker Ambulance (American Heritage Models)

I've recently bought three of 1937 Studebaker hearses and ambulances, then tried to identify the coachmaker and the model and couldn't.

It doesn't look like anything Studebaker had made that year. 

The most close thing is Coupe Express based wagon (nicknamed "Dog Hunter Wagon"), but it had two doors, not four.

The second guess is Suburban woody wagon, but it had a wooden frame, and the model prototype is obviously sheet-metal.

It appears that the only coachmaker who made Studebaker-based hearses and ambulances was Superior, and they used mostly President Eight chassis which looks totally different from this model.

So maybe the model is based on a fictional car?

American Heritage Models is not the first modelmaker using this mold, Phoenix mint (Unique Replicas) also produced 1937 Studebaker hearses and ambulances.