Looks good Lee. Needs a load though.....you could easily make it removable. Build the load up on a substructure support the size of the wagon interior, then use an elongated U shape to support it. As long as the U doesn’t reach the ends of the wagon you can push down on the end to make the other end pop up and so enable the load to be removable. I have seen this done on British outline railway models and it works effectively.
Nice looking Gon Lee, I Have seen steel coils in this type of car. It always impressed me that with 3 coils in a car it must have come close to 20 tons per coil. I learned years ago that 1 cubic foot of steel weighs 500 lbs. Approx. So one can imagine.