Ouch! Cutting those holes has gotta hurt! With all due respect, your car looks great and I bet it goes.....It's your car, do what you like, but there's no way I'd do that to my car. I would splurge for Doug's headers or deal with Spitfires before that, or buy a car that was already cut. Just my view.
What I want to know is, are there any problems associated with the headers hanging down inside the fenderwell? Like water splashing up (if you're caught in the rain) or dirt or anything else? I suppose you have to make sure tire clearance isn't a problem before you start right?
