I thought the price was steep, but that is for the completed and decorated model.
Funny, the May/June issue on N-Scale Mag. has an ad for 3D printed parts to make this carload.
http://wolfbonegames.com/Back about 9 years ago friend of mine and I made a complete Boeing train. We used a 1:200 scale model airplane fuselage (the 1:144 scale version was way too big). Here are couple photos.
We used the LBF cars and I build the guard/ice-breaker structure out of styrene shapes. Also scratchbuilt the fuselage supports and printed the decals. Back then the fuselages didn't have the protective green film on them.
Just last night my friend just ordered the 3D printed (correct scale) kit of parts - we will be redoing that train.