Because of the rounded support for the towers, i need to use the glue technique to master the stonework. I used this already for the witch chapel tower and consist of using straight carpenters glue to make copies out of my stonework mould. The sheet of stonework can be appled to every rounded surface with a hairdryer, a bit of heat softens the sheet again and it lays itself nicely around every surface
The bridge is covered completely with stonework and later covered with a filler. This one takes care of the smooth texture of the glue ( to smooth to do a convincing stone painting) and the thousands of air holes.