hey Sven,
i think it's okay when i answer here for Afinda, because he hasn't shown up for months now.
of course you can do some skins, because at Page 2 he posted the BMW templates. so if you want to, you can do some skins.
Problem is that Afinda didn't said exactly if he allows or not allows painting skins for him. he ignored Emres Skin and meant that we can paint it so he can "unwrap" the skins to the model, but also he set a copyright on the skins. so... think thats something only the moderators or even better himself can tell us.
To sum it up: you can make some skins for sure, but i'm in doubt that you can publish them.