Can't speak for modifying your cover, but I will say that when you install it, you will need a TON of tape, reinforcement supports, etc. anything to keep it conformed to your original dash until the "adhesive" sets. Don't skimp on this and you will be rewarded with a nice looking dash that will be hard to see that it's a cover. I did mine in my 69 Lemans many years ago and you still have to look close to see that it's a cover.
I will add that the opening edges for the vents are "rolled back" or radiused so not sure your plan will work, but maybe I'm not understanding what you are suggesting.
Good luck!
|