I'd look it over really good. Under the rocker trim, in the trunk, under the carpet, at the bottom of the windshield and rear window, the trunk floor drop off, look at the bottom rear of the fenders (just behind the wheel) from the backside, wheel housing, etc. If that is all the significant rot that you find, those might be pretty easy fixes (the rust repair part of it). You can save some money doing those repairs yourself and pay to have the paint done or whatever. It's pretty rewarding. Just ask here before you start so you get headed in the right direction.