I'm not surprised Central Valley had only one injection molded freight car kit.
The parts are very nice but getting them together is a lot of work. The plastic is hard to cut/sand. Plastruct solvent cement works, but evaporates almost immediately.
Neither Ambroid or Duco cement held the parts I had to fiddle with. Trying everything I could think of (even took out the dreaded tube of Goo) I tried Pacer canopy cement and it worked like a charm.
Used the canopy cement to put on the roof walk and it worked great.
I just hope the canopy cement paints OK, unlike white glue.
That plastic would be good for stirrup steps. It's definitely not ordinary styrene.