Has anyone done anything like this?

[HeavyMetalThunder_81]

The previous owner of my '79 quite brutally hacked up the dash where the radio mounts to fit a $30 Pep-boys special aftermarket radio. I'd like to put a stock two post back in. My idea is to find a truck in a junkyard that still has a good dash and, as carefully as possible, cut out the area I need for the radio then place it over the hacked hole in my dash and rivet it on. This is the only way I could think of fixing this other than replacing the whole dash. Does anyone else have any ideas?