It might be rather nice to have a sundial or two in some of the public areas of Colonia Nova, such as, perhaps, in the outside parts of the Preretorium and/or the forum.
A sundial vendor can be found in Orwood, by the name of PrimWorx. Their main line of business is prim model trains (!), but it is interesting to note that they also have a scale model Fachwerk house (no mod, alas) to go with them.
Those with private property in Colonia Nova might be interested in the sundials for their own use.