I like the looks of the MG versions. I have a few. They did both the centered cupola version and the offset cupola version. I have not checked the dimensions and locations of windows.
If you want to count rivets, Quality Craft (name before Weaver) did wooden kits for the N6B and N6A and you could assemble exactly as you like it.
The Weaver brass one is a bit of anomaly also because they put the doors in the cupola for brakemen to climb out on the roofs to set hand brakes, and then they put the modernized end railings with all the Doodahs and stuff that was much later rebuilds.
MTH did a creditable version with the centered cupola in 3 rail that would be easily converted. I have not checked it to drawings or the brass ones but stand alone it looks very nice and accurate.