I recently took a tour of the renovation of the Cathedral of the Blessed Sacrament in Sacramento, CA. They are renovating the structure from the foundation up, and it is completely filled with scaffolding. It was an incredible sight. I asked one of the construction supervisors how long it took them to build the scaffolding and he said it took nearly a year for the engineer to plan (had to reinforce the structure throught the basement) and months to build.
Unfortunately, I was pushing my the limits of my hand-holding ability by shooting with my CV 35/1.7 at 1/15 sec and portra 400 bw.