If I'm following this right (Which I don't think I am). You've editing the sky meshes to use sky box (cubemaps)?
http://www.cgtextures.com/skies.php
Please correct me if that's wrong.
Not cube maps, that wouldn't work, the sky texture still moves across the sky. It uses the exact type of texture as the original, just more detailed, and sprawled across the entire sky.
I could take a screenshot of the blender UV if you'd like.