Here's the hole and fittings:
There is still a good lip around the perimeter so it still is very rigid. I put touch up paint on any bare metal to avoid rust and wednesday I will be able to seal it off with some sealer, a metal panel, and self tapping machine screws. Using the screws around the perimeter of the panel will be more than enough to "keep things together" as cutting this little section out didn't cause any flexing or distortion. I'll post pics of it all sealed up when I get it done.