Hey, that's pretty good Kevin!
You should give DeepSkyStacker (DSS) a go with standard settings for a try over registax.
The DDS is free and works well to properly align your sub exposures. There is some learning involved, perhaps Google it for an inspection of what it's about.
To utilize the IceInSpace image viewer, you need to go Advanced and not quick post, and at the bottom, you'll see a manage attachments option. Just note the allowable image size permissible.
Good work though on your image!