Who remembers the N Scale mag article describing hacking up a Santa Fe caboose to build something resembling a center cupola Northeast style? I did one for my fledgling WM fleet, long lost to the mists of time... You needed two cars to get one, because the first thing you had to do was cut the two narrow SF cupolas together to make a reasonable facsimile of the wider Northeast variety... It was serviceable, but that article, probably published in 85 or 86, came out not long before Lifelike introduced their reasonably good model of a WM prototype caboose...
Build it, and the manufacturers will follow... The beat goes on...
Lee