cutting holes for factory AC vents

[TBONE1964]

Originally Posted by rcrahn

Thanks Kevin for taking the time to trace and send it. I did a quick layout and think it looks good. Now pondering how to cut it cleanly. I'm concerned with such a curved surface a big hole saw will be uncontrollable. It will walk everywhere. Thinking roto zip, but not sure if it will cut metal that thick.
Anyhoo...here's some pics.....

BTW, that is a very nice 69 bird in the photo. I had a 68 years ago.