The brake lines you can fix without a lot of trouble. Also sometimes loosening, repositioning, and retightening will often fix a slow leak. With your new flare tool don’t fully squish the second operation, form it fully enough it looks right, but don’t squish it flat. Leaving a very little give in the double flare let’s it better conform to the seat in the real fitting in use.
The rear axle you could find another center section quickly for 4.56 and probably free or real cheap which would be some improvement while you wait for the magical 4.10 to fall in your lap. You can do that swap in an evening.
Can you cut and weld to extend the latch, or mix and match old and new parts?
