Save or Scrap this 1983 300D?

[DieselHead]

Hi,
Looking for a bit of advice here. Long story relatively short, my parents bought a 1983 300D new in 1982 which was in use by us until 2007. At that time, it was given to my brother in law who used it for another three years until it was parked and not used five years ago. I'm feeling a bit of nostalgia for what was my first car and I'm wondering if I should try and recommission it. Here are the issues that I know of:

1) Vacuum leak resulting in non-working locks (and probably other issues)
2) A/C does not work
3) Dented rear door
4) Small rust spots
5) Some transmission delays or slipping reported
6) Rear exhaust rubber hangers cracked and fell off (exhaust was new though)

The biggest concern is that nothing was done before it was left to sit. If I can get it in reasonable condition, I really don't care how it looks and am happy to drive it as is. Except for the dent, it's in good cosmetic condition and the interior is nearly perfect. I'm willing to put in my own labor and spend up to $1,000. Anything above that and it's probably not worth it.

What do you think?

Thanks!!

Alex