Roll out two castle sheets using air dry light weight clay. Prep the plastic castle stone sheet first by wiping on a thin coat of dish soap to prevent clay from sticking. Tomorrow the clay should b dry and peel right out. I would prob. Do the stone different but to finish what I have already started, I'm doing it the same for uniformity.
My goal is to just finish this Hogwarts style castle build that I started years ago. I'm using the same colors and technique to maintain uniformity. My Hogwarts is my own happy interpretation derived from the books and the movies. I have deliberately used light cheerful colors (within the vicinity of gothic castle architecture) because I wanted to have a fun inviting magical experience of the wizarding world. Cheers mate!