If the delamination isn't too disagreeable to you, I say ignore it and enjoy the Alfa. I'd have to agree with a k that the repair will probably be cost prohibitive.
Side panels are usually laminated, bagged and heat cured in an autoclave. One would have to rout/plane the outside layer(assuming that only one layer is involved) of the delamination to get a smooth surface so a new layer could be bonded. If you were to just resurface with a over-layer of aluminum, I would think the 'bulges' would eventually show up again, if not immediately.
I've seen a few Alfa's with a delamination problem when we were looking and although I'm not sure of the process Alfa used for the panels, it would seem to be an expensive proposition for a good repair. Being that there is some structural integrity involved, professional help would be needed for a good bond. $$$ Good luck, Bob