Here is some information on St. Ludwig Church in Celle.It seems to be true that there weren't enough Catholics in the Celle area to have churches in towns like Hohne.St. Ludwig has it's own page in Wikipedia along with photos.I have a link to that page after this brief history statement.
St. Ludwig History Since the Reformation there had only been individual Catholics in Celle, mostly foreigners in diplomatic service or in court positions. In 1678 Niels Stensen initiated the commissioning of a permanent pastor for them. In 1710 a private house outside the town was converted into a chapel, that was placed under the protection of the apostle Peter and Paul and consecrated by Agostino Steffani. A hundred years later the idea of constructing a proper church took root. The design of the Church of St Ludwig came from the Lübeck architect Spetzler, the towers were the work of C. W. Hase and the decoration was by Wilhelm Clausing.