A great effort, Philip. I know that Matt surfaces always look much smoother than gloss surfaces, but the matt black will pick up any dirt and water marks etc to short order and look nasty. I would use a satin varnish over the top as a halfway house viz. looking good or looking mucky.
A thought on the domes. To get very accurate and neat horizontal silver rings, you could use an acrylic pen blocked up on spacers to the right height, and then revolve the dome whilst making contact with the pen. This will give you a great horizontal line.
Don’t be afraid to do a bit of revision sanding and touching up on those little areas that are less smooth than other areas. It’s the little things like that that make a big difference. It’s always easy to get the big surfaces looking good…it’s all those corners and wotnot that’s difficult!
Ashley