I bought a hot wire cutter today and used it to trim up some of my polystyrene hills for Blasthof. It was a novel experience, and one I haven't had since primary school.
Having been pondering fortress construction for a good few years I was amazed to turn out an entire bastion in about 30 minutes with the aid of a couple of templates.
I'll do another tomorrow and a ravelin as well.
My hot wire cutter is my best new friend.