heavy rust on body and brakelines

[falloutboy]

Hi,
I have to pass an official test here in Germany called TÜV. And they dont look to kind on rust spots.

What I'm dealing with right now is:
My brakelines arent rusted at the "usual" spots. Their rusted in the area of the auto trans and near the ABS hydraulic unit.
Are they prone to do this? What would be a good way to remove the rust and conserve the brakelines?

The frontsuspension, engine and tranny sit on this big crossmember (dont know how its called in english.) This crossmember is connected to the firewall with 2 U-shaped metal "things" -- Sorry no photo - these are heavily rusted -- Are they replaceable? If not. What should I do?

Another rust issue -- all, nearly all, my spot welds at the floor pan are rusting, but only the spot welds. Any idea how to remove the rust and conserve them?

Interestingly I never had rust issues with my car before this winter. This really comes all of a sudden.

So any ideas how to conserve the cars for the next years, and how to do it fast so I pass the official state test?

Thanks
Julian