I have a VW Karmann Ghia. In the past it has been badly restored. 3 of the rear lower panels have been replaced, but rather than butt weld them, they have use lap joints. This has caused issues (no surprise!). Lots of body filler and a big, crooked joint (no photos at moment). What is the best cure? Is it to cut out completely and replace the panels with new panels and re-weld etc? or is there a way you can cut out the bad joint and weld in a strip, or even just cut the new joint, grind back and re-weld? Any help would be appreciated.