Completely my fault. I did not notice the top of the lua needed filling in.
I found the location of the other skins, saw how they were named, and just used the suggested name that was in in the lua.
Thanks everyone for your help.
As for the Tiger A-4, I've always liked schemes like that and I really think it would look awesome in the game. Hopefully someone is interested enough to do it. I would try it, but my stick figures are terrible.