Yes, if it weren't for the body-rot the other items look like simple fixes. You could ask for a second opinion on the structural weakening, but if that confirms this test the car will be deemed permanently unroadworthy. It could probably be sorted with some welding, but all those things come at a price.

With all these items the car would probably not be safe to drive so getting a second opinion might be difficult unless the mechanic can come to where the car is.

The brakes issues might be sticking calipers - I had to replace mine for that reason and so you'd be looking at aound £600 for all four brakes.

The electrical items may just be a fuse or two, if you're lucky and can find it for yourself. However it might also be poor electrical connection if there's corrosion to the earth points.

Given the corrosion, that would be expensive to repair, so even if hte other items were fixed up you'd probably only get another year out of the car.

Unless you have an emotional attachment to it it's time to phone round and get a good price as scrap unfortunately.