For this, the side boards will be made of wood, however if we decide to make another piece to angle stone into the middle, that could be attached to the wood and made of light sheet steel. Also I am in the development stage for designing something for the tank/flat car to have a chute angled to the center of the opening on the flat car deck. This could give us a center dump car that would need one or two guys to help move ballast to the chute, and a side dumping car with a few guys to shovel the ballast against the sides, and a regular sided flat car.