I have a '39 Ford two door sedan. The bottoms of the rear fenders are really rusted badly. As these are compound curves, I'm a little apprehensive about tackling these. I thought about forming the right size conduit to the bottoms and weld new metal from there. Is this viable? Also, would it make anyone on here nervous to cut and weld that close to the fuel tank? It's on an S10 chassis. Thanks in advance, Rod