I don't think my 300D will ever look as good as yours. It's been in my family since I was 3, twenty four years ago, now it's mine. Even though I fuss over it greatly, I have not kept it up as you have, but look to your car as inspiration. I have some rust issues as well. Try and get galvanized panels like the way they made the W124's and newer models.

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63 220S W111
76 300D W115
2013 VW JSW TDI M6

previously-
73 280 SEL 4.5
86 300E 5 speed
2010 VW Jetta TDI M6