According the Rib Side caboose book, they began to add the yellow ends around 1974. The original scheme on all of the rib sides was the orange sides/roof with the maroon lettering, no herald. I think that the next round from FVM will have a yellow end option, along with the oil stove retrofit sides.
One possible discrepency I can see with the FVM modern herald scheme involves the white paint on the vertical end members. FVM has the white paint from the floor to the roof line, but all the photos I have seen only has white paint from the floor to the horizontal railing. Easy to fix with some black paint.
Best wishes, Dave