Dumpster Cars (Tra***rain)

Does anyone know of a kit to model the metropolitan trarain cars? Or is that something I’m going to have to scratchbuild? I just thought it would be humorous to run a trarain on my club’s layout. We see them all the time in our area (Washington DC/Northern Virginia) and people are always making fun of it. Generally, it’s CSX hauling them through, irony at it’s finest.

I’ve thought about using a rib-side hopper and modifying it, but it just doesn’t have the right dimensions. Any ideas would be appreciated.

Can you cut and paste a link, so I may see?