This would make a great 3D printing project - offer

I've made an offer to model the copper spire of Delmenhorst Stadtkirche for the Model Train Outsider. It looks fun to me, and leverages all my day job 3D modeling skills. Anthony Dodge, feel free to grab the contact form at right. The photo below is from Wikipedia (By user: Hombre), and you can see the interesting way that the curved base turns into a crease that makes the angled facet leading to the ocatagonal top a dart. There are several tools in Rhino that will handle this construction admirably. All I need to know is the dimension of the tower base it needs to fit, and the thickness of the walls, such that I can put a lip inside of the spire to let it set on top. 

Another shot from Wikipedia (Charlie 1965nrw) below.