Jim,
Looking great, I'm no expert by any means but since I recently did all this panel replacement stuff I think it would be alot easier and less filler if you only had to weld at the top of the fender and front edge by the door, since the bottom is all spot welds it's easy to replace the whole panel (since you have one) and less warping, welding, grinding.....I understand wanting to keep the factory spot welds but if you do it right you can make the replacement welds resemble factory to a point, or borrow/buy a spot weld machine for the pinch weld area.