Hi Caramon, Welcome to the forum. The trim will protect the side of your car to others that might not think much of your car when they get out of theirs. As for filling the holes up, if you are going to repaint your car, yes, mig welding them closed is the best way I think. After all of the body work is done you will be able to see if you have distorted panels that have to be worked out. The heat from the weld work will cause the just a little distortion. If you are having someone do your body work they should know just how to work the panel straight. Good luck and as always, everyone loves pictures to see your car in work.
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azmoparboy