Unity Skyboxes Help

I’m building a simple weather system in a Unity simulation at work and I’m using the supplied Skybox shader along with some of the supplied skybox materials.  The supplied standard asset skyboxes do a good job for part of what I need, but I needed a few more variations.  I decided to use one of their texture sets and make a few quick atmospheric modifications.  As I expected, doing this in Photoshop can come with some problems.  Texture alignment at the edges and corners required special attention, along with the box distortion.

I made this helper image as I worked to remind me of how things should work.