I used the Windows free programme Image Composite Editor (sorry if I have offended anyone by using the W word 
) I also used only files with last three digits 585,588,591,594,595,598,599,600,605,606,607) to get
It is not perfect but not bad either. What do you think? (I did not process the selected raw files before stitching, that is why there is no detail in the sky)