Colour is ok Greg in my opinion. I found that when I did this I got a similar cast top and bottom and put it down to gradients at the time but since then I have seen a few images with a similar look. No doubt there is a lot of Ha one side and on the other a lot of OIII on this target. In the end I chose a slightly less blue colour palette but I think you are reasonably close to what comes out of the camera.
Your detail levels are not bad either, though I suspect you are hampered by the lowest resolution setup. I reckon it would be preferable to image with the CDK for get maximum resolution at your dark sky location. Its a wonderful object up close and worth putting in the hours at a higher resolution.
Still some noise drifting around, but I found I had to do a lot of hours before it started to diminish. I am betting most of the noise is from the OIII as I found it very noisy.
Overall I like the look of the image, but would like to see you get a lot more data yet.
