Don't do this. Have patience, and spend more money (if necessary, vastly more money!) on a car with fewer problems. Otherwise you'll spend 5 years doing rust-repairs, 5 more years doing structural reinforcement, and 5 more years nursing your wounds after you realize in year 11 that new rust has already formed where you had replaced the old.
Alternatively - and it sorely pains me to say this - look for a less rare, less rust-prone vehicle of comparable low weight... such as a Mazda Miata.