I started cutting the firewall last year, about this time. The problem with cutting the firewall is that there are two sheetmetal stampings that seem to be valuable. I saved all of the sheetmetal that was cut out. I'll keep it around just in case someone wants to go back to the way the car was originally.
First cut is done, and the stiffening rail is being removed slowly at the spot welds.
Sheetmetal removed. There will be some trimming when placing the Coyote.