You have the right idea, but I might use an elevator instead of person. Otherwise you might end up with "Bob is a fat person" written on the board and poor Bob crying in the corner.

I would argue that you don't need to teach OOP yet. Start with OOD and considering it is already May 20 and the students probably have some sort of last program to work on and study for thier final, don't push them too far. OOP can be hard to pick up on at first. The ideas behind it are very easy, but the programming may not be at this point.