I'm glad I'm not the only person who does this, sometimes I feel like I must be crazy! It is a lot of work.
I have a pretty similar workflow, except with a GSO 10" dob and a modified logitech webcam, and using Hugin for the stitching.
I also don't bother with registax, I just extract all the frames from each video and pick the best ones by eye. I think your end result is better though. Here's my most recent effort
http://www.flickr.com/photos/malcloc...n/photostream/
Malc