This is a really awesome cathedral i did not have a chance to visit yet, but i definitely will some day. Just looks at this architecture, and how lights are playing inside the church through the windows. I do not know the reason, why it is not finished yet, but it will probably never win, like the Pizza tower will never stand straight.
Supposed to be finished in about 20 years, they can only build it with the donations that people pay to enter to the cathedral. SO, it takes some time :)
Why is it such a stupid rule? :) It will not be built in 50 then :) Those cranes standing there are depreciating faster than money is being collected :)