Check out this stuff called Q-Bond. Just found out about it a couple months ago... perfect for exactly what you need.
http://www.amazon.com/Bond-Repair-Small-Bonding-Adhesive/dp/B003YI421I
I broke a tab off of my door panel once and formed a thin strip of stainless steel to the correct contour and used JB stick to adhere that strip to the door panel. I also used JB Stick to repair the broken tab and once I sanded and painted it (actually colored it with a black Sharpie) the fix was invisible :smile: