Don't bother with the sunroof thing. Get into the glove box, buy a fuse tap ("add-a-circuit"), plug it into something that's switched on with the ignition, ground it to the big allen bolt next to the fuse block, run the wire up the felt liner next to the A-pillar, and you're done. Easy and clean.
Mark my words: People who aren't scared now will look pretty stupid if it turns out that they should have been. Harold Jefferson, Founding Member, American National Citizen's Institute for Alarm