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You're right, that will be the point that's under the most stress in a crosswind, when hitting a pothole, or just supporting the weight of the extension.
Do you plan to add some kind of access door to get at the hatch switch and lock cylinder? If so, you could use the same door to drive screws through the extension and into sheet metal. I don't know of any adhesives I'd trust with this job.
It might be easier to drive wood screws through the sheet metal and into the tail extension from the inside. The rear bulkhead carpet would hide the evidence, too.
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