Got brave and tried to make a removable scrap load for my NPR gondola. Cut a piece of polystyrene to fit the gondola and affixed it to a piece of foam to raise it up so I didn't have so much area to fill. painted it black and started gluing pieces of plastic scrap and brass and aluminum tubing to it. A little detail paint and...
Another view...
The load is just a press fit so when I want an empty gondola, I just pull it out.
Mike