He also designed the bridge from the Leineschloss across the Leine River and the Neustädter Kirche, built 1667 to 1670 as an early aisleless church.
One model is the organ from the 17th century of the Iglesia Colegial in Lerma close to Burgos, other models are in churches in Covarrubias and in Liétor.
He employed the Venetian architect Girolamo Sartorio as his master builder in 1667, who designed many buildings in the town including the Neustädter Kirche and was instrumental in the expansion of the Herrenhausen Gardens.