I'd say good luck with your research on that. I'd look forward to any info regarding them so I can add them to my collection.
Years ago Weaver did two bays with peaks on them. They really are not accurate, either. They had notches on both sides of the peaks on both ends. I think they looked stretched out also. Not sure about the origin of those cars.
K-line did some 2 bays that are close. I think they have the peaked ends but they don't have the distinctive fishbelly. They might pass for some of the less prominent classes of hoppers but not as an HL. Anyway, there was something about them that was off.
I think Weaver also did N&W cars painted on a C&O prototype a few years ago. I think they were 11 panel 3 bays. Not really accurate.
Weaver might have done an outside braced composite hopper but I could be confusing that with their N&W gon which is a pretty good model. The outside braced composite would not have peaked ends.
