O.K., now a lot of people have done cathedrals in the most astonishing ways but no one build something like this. It's not only instantly recognizable, it's original in the building technique! Very very good job, indeed!
At first glance I thought it was a completed MOC! It really looks great! I had to look it up in wikipedia to see the real one since I have never seen it or heard of it before. Can't wait to see it completed!
I actually visited this cathedral last October, and wanted to build it out of LEGO eventually as well. I climbed the steps to the top and sat on top of the roof looking out over the plaza...it was spectacular! As is your build! Can't wait to see the finished project!