40 hopper cars on the wall! 40 hopper cars!

[Sumpter250]

mass production time! Woohoo!

There is more that just a little sense in that concept. Sometimes it is easier to do each step of the build on every car, before going to the next step. Drilling, cutting, or assembly jigs for each step would also be of great advantage, and would allow for future expansion of the number of pieces, should the need arise .
In any case, this should be an interesting adventure.
Oh, the "required caveat"..........any mistake, would show up in every car.