480MM RADIATOR UPDATE
I wanted to triple check I had the radiator grill aligned properly so I clamped it to the case to get some measurements and line things up perfectly.
After marking the appropriate spots in the case to drill out I used the piece I'd cut out earlier as a guide in case the dremel wanted to jump around while I was drilling.
The drill spot marked with black marker and center punched.
..and done! didnt even put a hole in my leg or anything :p
All the rivet holes finished. On the left side of the opening you can see the small lip/curvature I didnt cut out at the time and had to go back and remove later.
The 480mm radiator grill in place, if temporarily :)