Hello everyone currently working on my 73 Mach 1 restomod and making some progress until I stumbled to an issue. Working my way from the front of the car towards the back found my door pillars with some rust damage. I removed all interior parts and dismantled the front dash, but trying to see how to address this issue I am stumped how to take care of it. Any feedback or hints how to correct this is greatly appreciated. I am enclosing a picture of the rust damage and is the same in the other door pillar also.