If you take the ?intake cowl? (I think that's what it's called) the piece between the bottom of the windshield and the back of the hood off, you can run your wires down in there. That's what I did. Just 5 or 6 screws to take out and it comes right off. You can see the wires running down into the cover. Oh and no drilling or taking the windshield down either!
I found a step by step on here i think though that was a couple of years ago. Google should be able to find a write up for you.