You could probably use a nut/bolt combo to hold the nut in place while welding. TIG would be harder than MIG most likely, but if you didn't burn through the outer metal it should work. With the interior panels out, you can easily access the back of each outer metal panel. The fiberglass panels are thick enough that it would probably be easier to make a recess to accomodate the riv-nut (which may be what I do).
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