I'll admit that John's solution looks a lot like what I suppose that you think you wanted, but then again it looks like you might want to shell out the hull to 0.0625 inches thick. If you're interested in the sort of thing that you'd need to do in order to achieve that then take a look at the attached file.
Best Regards
Hudson
www.jamb.com.au
Nil Desperandum illegitimi non carborundum