The changes needed for Air to use a NACS port, and charge at 225+ kW on a 400V Tesla supercharger, go well beyond sheet metal modifications. Basically, the Air would have to be reengineered to take Gravity's Rear Drive Unit, possibly also affecting the rear trunk design and the car's thermal management system, its Wunderbox would need a redesign, and left front and left rear sheetmetal would need redesign and retooling. And some software changes to match. These are just the things that are obvious, I'm sure there are a few other large items and likely hundreds of small ones that I'm not aware of. I'd guess this would take a dozen or more engineers a year or so of effort. Let's hope for model year 2028.