Lower door patch repair

It's only sheetmetal, 20 guage bends easily with basic hand tools - pliers, hammers, ect... if your talking about the corners of the inner part of the door dont be afraid to recreate the part with several different pieces of tin and welding them together.You could also find a solid door at a junkyard, maybe one thats dented that nobody wants and cut the piece you need from that. Most inner door shells have a similar shape to them.