68 Barracuda FB glass pinchweld modification idea.

I hate the fact that a good deal of water ends up with no place to go on the lower right and left of the fastback glass area. When I took my car apart I could tell that the gasket had leaked and let in water and I had rust on the inside. I thought about drilling a hole on either side at the low point and using 5/16 or 3/8ish tubing to braze to the hole and bend it up so that it dumps out the bottom of the quarter on either side much like you'd see in cars with sunroofs. Other than it plugging up and needing blown out from time to time, anyone see a problem with doing something like this???