Some comments on the list of probable repairs:
Rudder rebuild: The survey should tell you if you need a rudder
rebuild. I bought a new rudder for my 33 ft boat and that cost $ 800.
Standing rigging replacement: If the rigging has not been replaced it
is high time after 20 years in salt water. I replaced my standing
rigging one shroud at a time, without taking the mast down. Cost $500.
If you take the mast down it probably doubles.
Running rigging: Depends on condition, but not a high cost item
Bottom paint. Maybe this can be done during the survey? But it
certainly will have to be done.
Motor maintenance or replacement: A rebuild diesel or a new one may
cost up to $8000. So I would not buy a boat where the diesel needs
replacement. Routine maintenance ( oil, filters, zincs, fliuds ) will
need to be done. A boat with a bad engine is a "project boat"
A new deep discharge battery can be bought for $50 to $80. So this is
minor.
Sails are often blown out and need to be replaced. For a 33 ft boat new
sails cost $4000. But i used the old ones for a year and then replaced
them, what a difference!
Cushions are cosmetic. I recovered mine myself for $400 in fabric.

In summary, I would not touch a boat that needed serious engine work or
that had serious delamination. Boats with those problems are project
boats and sometimes sre not worth getting unless you are really into
this kind of work.
The other items are relatively less important and you can simply
discount the price of the baot for that.