Trimmed the corners off the wall sections so the whole fortress fits together much better. Still a bit of light sanding of the wall ends to make them abut the towers properly. Plus a lot of detail work left to do. Haven’t decided how to represent the main gate. Balsa wood? Or something a bit classier like some Hirst Arts resin wrought iron detailing?
I actually used about half of the 20kg bag of Ultracal 30, but did cast enough pieces for some additional terrain.