Everyone has been so nice to you with this pen Paul and it really ain't that bad but I do see exactly what you mean and I would be same if it were mine.
It looks like the bottom has gone off center. Did you turn them as separate pieces?
I would suggest putting both bits on a mandrel and spinning them as one piece.
The other thing is, I see no benefit of having it as a long top it would be as good if not better as a normal slimline with or without a belt in the middle.
Just my opinion.