Right, testing is finished, and the outcome is that this will be an add-on pack, containing the new WorldZ geometry required, but not any of the original WorldZ geometry. It will also contain the 8 props previously mentioned, as well as all the new textures required for WorldZ of Chivalry. And for any WorldZ owners who havent got a copy yet, there is Urban WorldZ add-on pack available in the Free Stuff here at Renderosity, Poser City, and, of course, 3dmodelz.