Driving home from work two nights ago and had to put my foot to the floor to stop my 95 GSR!

When I got home (very slowly in 1st and 2nd gear), I saw the reservoir was empty, refilled and put my foot on the brake and saw and heard fluid shooting from near the gas tank. When I put the car up and got under I observed the brake hard lines had rusted away. The car did spend half of its life in Vermont so I guess the salt eventually got to the lines, every time I get under I see a good degree of rust. How do I repair this, it looks like 4 lines (ABS System)? Also should I also replace the rubber brake lines to SS ones, how difficult a job is this? Thanks