Funnily enough, I actually found some Atlas N&W Fishbellies for sale the other day! Scooped up all I could find.
To clarify, I'm fine with "close enough".
Regarding Yoder - I believe I have seen one of his models on eBay, can't remember which, but that is it.
It is looking like I will have to keep an eye out for Atlas Fishbellies for now.