Living in Poland for the last year, I'd wanted to build something like this. My cathedral is based mainly on St. Mary's Basilica in Kraków and St. John the Baptist's Cathedral in Wroc³aw. The main steeple is a close facsimile to the one on St. Mary's, including the crown. The roof above the nave is removable so that it's possible to put minifigures inside. The cathedral is much smaller than minifig scale, though a few of them can stand inside anyway.