I too, replaced my firewall, cowl, inner fenders & rad support – all with AMD. It's strong stuff. Since your replacing the inners, it will be easy for ya. It was a first for me and everything turned out amazing!. First welding project, really. PM me with any questions you have – I know I had many. I'm doing my floors, rear rails, tubs etc right now – I'm a bit overwhelmed. good luck. oh, and your lower drop off pieces are called trunk extensions.