This is one idiotic enterprise IMO, but whatever floats their boat.
If "we think" it was built spiral-fashion; if "we don't know" how it was built; if "we aren't sure" why it was built; if "we have no idea" how it origianlly looked:
Then how in Hell can "we fix" it?
Maybe they could just follow the current trend of archeology, and bury it in plaster of paris, until "future archeologistss have the knowlege and expertise to properly study" it.