Great idea Warren, I am going to use the same method. I am in the same boat as you, I do not have videos of my own to do it. I have only done stills to date. The other thing is I am new to Astro Image processing, used film to date, and I am totally confused by the number of packages I am trying.
- Nebulosity – which I hate, sorry maker I am sure its good, its just me !
- Registack – which is indecipherable
- Gimp
- Maxim DL – almost out of the trial license and have barely scratched its surface
- Iris
- Virtual Dub
- Canon Digital Professional
- Deep Sky Stacker – which seems easiest but does the least.
Never say die.

Cheers,
Peter