...yeah the floorpans will be easy to cut out and spot weld in new ones. The rocker panel shouldn't be to hard, but you'll have to get creative. First, grind all the rust away and use a body hammer to tap out all the weak spots. Once you've done that you will know how much metal you're going to need to cover the hole. Take the body hammer and create a dent around where the rust is. large enough to fit the replacement peice of metal in and weld it into place. Then once the peice is in and the dent is lower than the normal rocker surface fill the dent with plastic. Sand smooth, prime, and paint. Or you can just cut out the entire rocker and put a fresh one in, but that would be a REAL PAIN!!