Iirc, the front sun roof drains go down the A-pillar and into the sills under the doors. The sills have 4-5 drains along the central pinch weld, which have a habit of getting clogged up, either by rust or by anti rust treatment. The sills are open at the front, behind the kick panel as well. I just had a wet carpet under my left foot (LHD), and then heard sloshing under the floor, so I blew air through all the drains and got a bucketfull of water out.