Thanks for your responses as far as bonding the aluminum to steel frame ,it can be done with body panel adhesive.Apply a bead on the door frame then fold the lip over before it dries.Why I ask about fitment is because I have some rust along the lower seam and the only way to fix it properly is to remove the skin sandblast and coat the frame then fold over a new skin.Patching the bottom is also an option but then you have heat distortion to deal with after welding.
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