The roof rails, the things that run down the length of the roof, are attached from inside the VX, so you'll have to pull the headliner out to get to the bolts. I'm getting some rust bubbles in my paint at the front of both of those rails and the thought of taking the headliner out to get the rails off to repaint it, is what stopped me from doing it so far.
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong, it usually turns out to be impossible to get at or repair."
-Douglas Adams, Mostly Harmless