Yay!!! The smooth rods finally turned up.. So I was able to start the final assembly of the Rostock 3D printer.
The smooth rods are longer than I need at the moment but I purposely have not shortened them. Currently the belts I have allow me a build height of just over about 200mm which is plenty for me. The nice thing about the Rostock design is that simply by adding longer belts I need only raise the top an I get more build height.