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two different metals can suffer from an electrical reaction, destroying one of them.
On fire trucks they used sheets of Mylar or some rubbery material, and they still can suffer corrosion.
Now, they do not put different metals together.
Steel panels and compatible screws would be a good choice.
They now have glue that they use extensively in cars - some really high end cars are now glued together.
You cut out the part and add an offset flange then cut your patch to fit the flange. - see
http://3mcollision.com/products/fillers-and-glaze/smc-repair/3m-panel-bonding-adhesive-08116.html
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