I found where the mod stores the colors, but I don't see where the tail type is stored. I saved 2 skins with different tails, and none of the pixels appear different. If it's supposed to be the 2 pixels left of the colors, doesn't appear to work properly. Still need to actually check the export function with my friend when I get home.
If someone could just upload a simple skin key for this mod in the form of a png, I would greatly appreciate it, and I think this guy would, too.