Yes, I do believe it is plated.
I’m not sure how I want to go about cleaning it yet, but I’m leaning toward a simple steel wool and oil approach. It definitely needs disassembled and cleaned/oiled.

If we can say with some confidence this does not have a fancy provenance, I may add more cutouts. For example, the gas cylinder block isn’t cut away at all. There’s some neat stuff in there to see!