Rustoration Heeeelp!

Hey guys, so my "super clean" duster I just purchased is not quite as clean as I first thought. While clearing out the engine bay to begin what I thought was simple body work I found this nice frickin rust rot on the passenger side of the firewall/cowl area. :wack:disgust

The below photo is a bit deceiving... There are two layers of metal about an inch apart (one visible and one hidden behind that first layer. The outside that you see is rusted completely through, that's just a gaping hole. The rust you see is on the inside of the firewall/cowl area whatever it's called. That little circle you see is where I poked a screwdriver through that layer too!

Any repair ideas? I am not a welder, nor am I going to try and learn on this. Should I just cut the entire rusted area out and have someone weld a patch in? I'm not sure what to do about the inner layer though? Can access to it be gained from dash or fender removal? Also what do I do about the pinch weld that's right there? This seems like it is going to be a difficult fix. Would patching with backing mesh and fibergass bondo be that bad?



The outlined rust area in this photo is the approximate extent of the rot...

:mumum: