So I did a bit of searching and found the following "peaked end" N&W hoppers:
The first one is a brass model I believe, originally posted by Gilly a couple of years back. The other two are one to one scale prototypes; one inside braced and the other an 8 panel outside braced. It appears that N&W had many different styles of coal hoppers on the roster.
Importantly, the peaked ends are usually part of the full end panel, with no horizontal brace or visible seam at the height of the sidewalls.
I also grabbed some coal facility and loading pics: Many grades of coal are being loaded in the first pic.
This pic is interesting. These appear to be 3 bay 70 ton hoppers, so they may be too new for the desired pre-1964 period prototype, I don't know. But the right end of the middle car shows a horizontal brace running across the end panel at the height of the sidewalls. So if we were to build addon peak pieces, there is a prototype with the cross braced ends.
This picture shows some of the variety of hoppers N&WE had. Most are peaked ends, but the row at the far left clearly shows quite a few with no peaks. The row at the far right shows inside braced hoppers with squared off side panels. Another variant.
I am sure that true N&W fans out there will be able to ID many of the above cars in terms of what years they were produced.
But I guess the question is this; if Beth does a custom run of MTH fishbelly's, would addon peaked end pieces (with visible horizontal cross braces) look close enough to prototype to appease the N&W purists?
Rod