Recently, I posted images of my dad's work in the form of the Shell Keep and the Crusader Castle. I've seen this done dozens of times. I don't have these skills myself, because I don't practice these skills. Maybe it's time to change that.
I pulled together some scraps of stuff I had lying around and got started. I want a castle, but maybe I should start smaller with some houses.
The larger structure will be a keep. Perhaps in a motte and bailey design. Or maybe it will simply be free standing. Not sure where I'm going with this, but the effort is fun.