In 1483 (who carved the statues of the Last Judgement) became the master mason. Under his direction the nave walls were raised and the tower was built to the lower octagon. Construction on the lower rectangular tower began in 1481 or 1483 and continued until 1489. The upper rectangular section was built between 1489 and 1518. Following Küng's death in 1506, lead the construction and finished the vaulting in the choir. The lower octagonal tower and roof were finished between 1518 and 1521. In 1571 was brought in as master mason to finish vaulting the nave and finish the work. The central nave was finished by 1575 and at this point, construction stopped for almost three centuries. The organ was installed in three stages between 1727 and 1783. The bell tower, with the largest bell in Switzerland, wasn't completed until 1893.