I usually sand the top plate down as you have done, till the brush marks are out, then use brilo soap pads wth lots of water to bring the shine up, then spray with a clear. Thats version #1
Version #2: Perform version #1 without the clear, then have it chrome plated. This is my prefered version of #1 and#2
Version #3: Perform version #1 without the clear, then have it copper plated.
Bernie.