Brain dead side skirt Q

Wow, finals like...suck. Seriously. Anyway, too many finals have wiped me out, and now that school is out I figured finally installing my Wings West kit would be a good project to tackle. The thing is, I am not sure if I need to remove the stock side skirts before installing the new ones. My searches either turned up nill, or I read the answer and was too stupid to realize it.

Now that that's done, I think I'm going to hunt down some more morphine...

Mmm...morphine...