Think it through, that car is no where near a parts car and it might be cheaper to address the rust, correctly, than you think. Sorry for your situation though.
i checked around and found an excellent sheet metal guy. $40 hour plus parts prep and repaint car because both side need replacing along with wheel tubs. we're talking 7-8k. if i did do it it would not be half a$$ like the previous owner had done. this car is not a $14000 car.