The way I do things and personaly the way it should be done. When your doing a patch panel you want to match the original sheet metal thickness that your working with. This way you can make an exact pattern and but weld (tig) the panel in place. After but welding grind only the weld down and then you can hammer and dolly out the metal shrinkage or fine tune the area. As for the dash it's your personal pref. 18 guage would probably be a good start. Not to thin and not to thick. Besides after you give it a little shape the integrity of the metal just stiffened up tremendessly
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