Welcome to CHR! We'll be looking forward to pictures of your progress on the Chevelle!

Just curious, why do you not want to weld in a patch? The "Right Stuff" approach is going to work fine, but a butt welded patch will eliminate the overlap joint which is going to be a moisture trap. Not saying it won't be good with the POR15 and Right Stuff, just wondering since a patch panel, or even sheet stock would not be that hard to do with the seat out.