I was having a play with this a few weeks ago. I don't know what it would look like if you shot s2 as well but with just ha and 03 I would only expect two colours.
I did make one version that had the red on the outside but as its just a photoshopped version I wouldn't want to show it.
I ended up just using Pixinsight for my bi colour version, you can shift red to a yellow in seconds.
http://farm8.staticflickr.com/7427/9...22c40d26_b.jpg
Helix Nebula by
Raymond Collecutt, on Flickr