Bakelight? Movie prop quality stuff there. I think you can polish that stuff?
I've worked with it before and its tuff stuff to work but it holds its shape againts rough handling. You'll have to use different paints, adhesives, primers... screws when possible.
You can really get creative with lighting and finishes. Best finish for any metal parts is powder coating.
You've got a lot options here for a truly stunning mantle piece!