Considering these cars will not become "collectible" you might consider doing only those things that are related to things that are broken or breaking .... on the other hand, as I was a P-3 driver, I assume you have LOTS of time off, so why not rebuild anything you want! :->

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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg