My favorite thing to do with the plates now is apply them as decals to a couple of pieces of scrap sheet plastic, then give them a good coat of clear and trim them out. They withstand bumps a bit better than the paper does.
Overall, I'd say pretty good! Only recommendations I could make would be to mask larger areas, like the panels behind the doors, so that the edges come out cleaner. Sometimes I'll even take a fine Micron pen around edges like that and touch them up. The engine compartment looks good. I'd also recommend getting some polishing pads for the paint. It's hard to get a good, shiny paint job without them.
I've got an odd question: In any of the parts packs, AMT or Revell, are there the smaller tires? Like the ones for the Capri II or the Corvair kits? It'd be nice to have for cars that had smaller tires to begin with.