Same problem - just starting in one corner

I have an 03 Cabriolet and approximately 6 or 7 inches of the cloth is pulling away from the glass window on the lower passenger side. I'm beginning to wonder what good is German engineering if 7 inches of cloth coming unstuck results in a several thousand dollar full roof replacement repair?? I took mine to a trusted auto body shop and the owner recommended a local upholstery shop that has experience with convertibles. I will bring it in next week. I don't trust the glue solution (though I have bought some Gorilla glue and am tempted to try it). Does anyone know if tempered glass can be drilled with a fine bit? I would only have confidence in glue of a few stitches could be added to reinforce the connection between the glass and cloth top. BTW: my A4 is garaged DAY and NIGHT, only 58K miles - this is a manufacturing problem that will begin to cause Audi problems very soon. I've seen more failing the same way mine has.