character hand set up?

[Delta Hawk 1829]

I'm making some units but I don't know how to set up the hands to make them switch with faces. They're the normal BIS hand models that are already weighted, but I don't know what the texture should be nor the name selection. If anybody can help me out with this I would greatly appreciate it.

Also, is there a way to use one character model but in the config change certain part's textures, like swapping uniform patterns?

Thanks!