Thats actually not a dent in the roof. Its a weird reflection in the picture. The hole in the step up is in the inside of the van. There is plenty to do in there still. I was working on the outside only. As for the gap in the rocker I can seal that if you want but it will rust worse with it sealed. The majority of rust in IHs is caused because water and dirt can get in through the smallest of gaps but then can't get back out. International was notorious for double stacking metal. Metal on metal will rust way quicker then having an air space between it.