Your poor car has the 617.XX engine; all these 5 cylinder diesels have
cast iron blocks and cast iron cylinder heads - that's one reason they
are so durable. The '86 and '87 300D and 300SDL have six cylinder iron
block aluminum head engines.
Your engine is governed to about 4,600 rpm.
You mention a lot of damage but don't comment on the car's major $
areas: paint and seats. If these are in poor condition it's another
negative, otherwise, the car may be worth at least minimal restoration
so you can drive it for a couple of years.
Remember, at least you know the history and the good and bad of this
car, another car is a discovery process.
Have a mechanic check the front suspension and steering linkage for
looseness before investing any time or $ in the car.
Rear window switches on console are dirty, right side window track and
motor may be busted from the door being dented.
Right rear door - get a junk yard replacement door use your car's glass,
track and motor if its not busted, also your interior panel.
Window and hood seals ought to be replaced only by a competent auto
glass company. Get their price, including an agreement as to what
happens if the glass breaks during their work (a possibility, especially
the rear glass).
Lights - check the bulbs and fuses.
Turn signal - live with it.
So for not a lot of $ you can make this car go for a while but don't get
carried away, it's still an old car with a limited market value; a major
engine or transmission failure will consign it to the scrap yard.