Auto body repair & detailing: old rusty corolla, corolla station wagon, bearer of bad news

Question
I have a 91' Corolla station wagon. It'a good car but it has a lot of rust - even rusted through in places. I was wondering what the average cost to fix this would be. Not worried about paint right now. Just trying not to let my car disintergrate.

Answer
Hello Izaac
I'm sorry to be the bearer of bad news, but that year , make and model of a vehicle is not worth fixing.
The average cost of repair would far exceed the value of the car
I believe you when you say it is a good car, but, it is time to get a different one
Dan