I bought plans from this website http://www.myshedplans.com/cb?cb=jrios12345 and found them to be handy and pretty quick on the download. Only thing is they arent certified by an architect so I dont know what you would have to do about turning in plans for inspection
A couple of questions I have, where the sheets staggered like the picture that was posted above? Did they use screws or nails. If the sheets are staggered then it sounds like you do have some leveling of the home. And what I would personally do is either live with the crack for a few more months...