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.
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Just last night my friend just ordered the 3D printed (correct scale) kit of parts - we will be redoing that train.