That's true, but given the defects in place with no flats, I might as well do it from scratch next time (with flats!). Maybe even put in 2 - 3 hours next time.
...which it will need to help defeat the noise anyway.
I'm still a bit surprised at how well this image turned out. The conditions were not great - getting low in the sky and the wind was gusty at times. It has set a high-ish bar for me to beat when I *actually* have everything going right.