I think one of the biggest issues with these things is that there are so many variations.
Baldwin was, essentially, a custom locomotive builder that was quickly iterating through changes in their diesels.
I bet a reason Atlas did the VO-1000 was that its car body changes between large owners were easy enough to accomplish.
But if, for example, there were three big name owners of AS-16s and they all had different hoods? Well, that's gonna be a challenge.