I've reached the point where I think the copper sheet bottom is as good as it's going to get with the tools and materials I have on hand. If I'm going to use more of this stuff I probably need some basic metal working tools and a power polishing rig of some sort. What you see I basically did by hand. I tried to knock the dings out with a hammer and some oak for backing. It kinda worked. Now I have shallow little hammer dings instead big ones. I wet sanded all the crud off and polished it mostly by hand. So there is still some micro scratching. It looks pretty good. Most of the defects probably won't show. Even so, I'm debating getting the right tools and doing more. I'm not sure the cost justifies what I will get out of it. Gotta consider this for a bit.
Here it is. Hard to see any problems without moving it around in the light.