Is DIY out of the question?

The injection pump might simply need a cycle of Diesel Purge and an updated rack damper. Maybe send the injectors to one of the forum members who cleans and balances them. An independent isn't likely to oblige you other than to replace the rack damper.

Replacing oil cooler lines is a nasty job. OE quality lines are very expensive. An alternative is to have the lines repaired by a hydraulic shop. Again, an independent isn't likely to be part of this.

The tie rods and drag links have ball joint type ends. When the boots tear and particularly if they've been torn for a while, it's best to replace the link.

This can be a contentious topic but I advise to stay away from Chinese made parts for steering, suspension and drivetrain particularly if you're paying for installation. Any independent who's been in business a while was probably burned by parts of questionable quality (spelled U-R-O) and steers clear where the work is warranted. Caveat emptor.

Sixto
MB-less