Years ago my husband was approached by a church organization to re-structure their bell tower on their church. As a contractor he has done a lot of unusual structures in his life. But the Church tower itself was ninety feet off the ground and standard scaffolding would not reach the location without a high risk of accidents. So custom scaffolding was designed for the job. Just to set up alone took three guys and a boom crane two weeks to place it at the site. After this was built to tear down of the original tower and the re-build of the new one took four months to completion.