Molding the "box" of this thing to the form of the hood and around the fender walls and sealing with some sort of weather-stripping is the only way to go here. Simply a square/rectangle box isn't going to do much good, it would have to be too small.
The fender hose idea sounds good too. The hole's there, why not use it?
Sounds like you're covering all your bases unisys12, keep up the good work! I definately can't wait to see the finished product (and make a purchase hehe)
