Really nice work, John.
The only suggestions I have would be firstly that you need flats
There's some dust on the left. On the right edge there's a vertical light section which you can crop out and that can also help with background extraction algorithms from your program of choice.
Colour cast is also a bit off.
But all of that said, this is amazing especially for an unguided shot. Really well done, you should be proud of that.