I was way out of my league with things..Just look at some of the things that one guy 3D prints for his builds..
Lordy. There is a guy on the AACA forums that makes stuff like this out of brass. Does a bunch of 1:16 scale models that they are incredibly detailed.
Wow!!! If I am to believe what I am seeing, while not an original Delco radiator cap, I'd put one of those on all of my scale radiators! That said, mayhaps I am missing something on the last pic...??? A scale "declawed lobster," for the "Maineders...???" (Maybe "humor," or maybe I really am missing something...)