I did the same thing on my 84 300SD. I did however take it to several people for several opinions. I would suggest taking it to an MB garage and "pay for" an inspection. I am fortunate that I have a mechanic that allows me to buy my own parts an he puts them on for labor only. Some of the things you listed can be done on your own, the steering shock is a $20 item and takes 5 minutes to R/R. I am wondering why you would need front bearings, these rarely need replaced unless totaly ignored during PM checks.
Do you have PO maintenace records. These are a must when you go to buy these old cars.
Calipers ? are they not releasing? This too is unusual. The rest of the items seem logical. Front end work requires specialized tools and knowledge. If one of the front springs gets away from the frame it will kill anything in its path.
Good Luck