Hi , I have used sphere mask to show the moon instead of the sprite texture. I was having some issues with that. If you want to have moon texture with phases and all , a custom skydome has to be created in 3ds max with the moon texture as one of the UV channels, similar to the one dome in the package Ultra Dynamic Sky. If you want , i can work on that and add that feature in my package.
Can you please tell me what problems you are having with my post process ?