I remember a few years back one of our members while on vacation stopped by to see the Arkansas & Missouri.
When he got back he was determined to model one of their C-420. He showed me the article where someone used these shells as a starting point and retrofitted them onto an Atlas U25B chassis with decent results.
A few years later Atlas released their C-420's and he promptly thew his shells in the trash and ran to the LHS and ordered all three numbers.
The best thing he said he ever did. LOL