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Just a question regarding welding thin sheet metal. Typically the wire used in a wire feed is either .030 or .035. My Miller 211 auto set is designed for that. But .023 wire is available and can be used in my Miller wire feed.
For welding thin sheet metal would .023 work better for reducing heat and warp?
I'm far from the experts above but I help at a body shop a couple days a week mostly just to get out of the house. LOL.
They use panel adhesive for rust rocker repair all the time.
So maybe not a good idea but maybe fab some brackets that could be bonded to the under side of the skin and then panel bond your patch panel to them?