if there the only problems, they shouldnt cost a lot to sort. i wouldnt worry about rust on the top side aslong as its not rotten. but id be making sure structuraly its sound, because ive known of a couple that looked mint on the top side, no rust at all, but underneath, sills, floorpans, and chassis legs were rotten. so make sure if you do buy it, you spend plenty of time looking it over, and checking EVERYTHING.