That picture of Gringo is nothing. Back around 1980 a steel sailboat got broadsided by a freighter. The dent was 9 feet deep! The boat was bent like a banana. The guy sailed it home.
You should take a look a Brent Swain Origami construction boat. There is an Origami Boat forum on Yahoo! with lots of pictures and stuff. I sailed on a 36 footer and was very impressed with the way it sailed. Steel used to be lot of maintenance, but with modern epoxy coatings that is no longer true. They also do things like weld in a little stainless anywhere you might get rubbing or chafe. Then when the paint wears off it still doesn't rust and you don't bother even touching it up.
Gary H. Lucas