Hello, I'm restoring the trunk floorpan of my '70 Plymouth. There was already a big chunk missing in the center. After applying wire wheel, more holes appeared, but that was no surprise ... I'm going to do the metal fabrication myself, but I'm not experienced (actually it will be my first time with a bead roller). On the pictures you can see I have outlined (black line) the area where (I think) I will need to cut. What would you suggest and/or what would be your advices about that cutting ? Thank you.