Sweet. That looks great.
Now we need someone else to print one out and see if it fits another vehicle
I posted the updated files to:
https://www.thingiverse.com/thing:5870011 (Eric, I used the photo from your last post in the description of the part to show how it looks installed)
Share them or the link as you see fit. I did save the files for the next to last revision before the lower corner radius was change, just in case. When and if some prints another one and it fits their Firebird too, then I'll ditch those files.
Thanks to all that provided info, photos, parts, ideas and measurements to get this project done.