I'm working on an openforge model of Nightstone (Storm King's Thunder) and the one thing I can't find anywhere is a good, simple bailey wall. Just pointed sticks, 2 or 3 squares long that can connect to one another. It'll end up being a round wall around the village, so it doesn't have to fit perfectly on a grid or have 45 degree angles or anything, just a tall pointy fort wall.

If you want to go above and beyond, the motte fort has a raised platform on the inside wall that could be really neat to play with. Problem is, since it traditionally forms a circle (as it does in nightstone) a nice 50mm x 25mm wall would leave gaps. You'd almost need to make it a slight trapezoid shape.