TBH that's looking fine, ok so there are some marks but now you need to step up the fineness of the brushes you're using. What did you use to get that finish?
I told you that bolt would be stuck didn't I? Gotta get it out now Ted before you go any further, got Max making some out of stainless so even if you ruin it getting it out it's not the end of the world.
Seriously, keep at it, I did say you'd be asking yourself what you had started and how you wished you hadn't, again and again. That's the inexperience talking, I went through it, Roos going through it and so will everyone else, I'd be pleased with that, sure there are some rough patches but you just need to use finer and finer brushes, trim the edge down with a flap wheel where it's broken, give it a shape, round the edges off so it looks like it should be like that.
I'd say another 3-4 hours and that will be fine.
Get some wire brushes for the Dremel, NOT brass, waste of time brass brushes, get forward facing wire brushes, metal ones, get into the centre of those rivets and get all that rust and corrosion out, get into the corners where the flange starts, smooth out those scraggy bits you can see.
It's coming on Ted, you may have the knack