Tricky data!
I had a quick go with the 16bit file in AstroArt, Downloaded the 32bit but I think it got corrupted as it wouldn't open.
In no particular order:
Crop, Gradient removal, white balance, Stretch, Curves, etc.
Not real happy with the background colour.
Tried to keep the colour as natural looking as possible.... well, natural for me that is.
Would really like to give it a go from scratch, but downloading 100something canon raw files doesn't appeal much