3D printable 8 Panel 2 Bay Hopper in HO 1/87 scale and N 1/160. The cars just require trucks and couplers. Eight Panel Two Bay hoppers. Also included is a Sketchup file if you want to more easily make your own edits.
STL (Stereolithography, filesize: 11.3 MB), SKP (Sketchup, filesize: 8.56 MB)