Here is a WIP shot of my new ECW siege artillery battery on a mound. Last night I added a few more Debris gabions, build the earth around them up and cut the base. Tonight, I need to model the approach ramp at the rear. I have an idea that I could build a gunpowder magazine into the side of this.
It will be an earthen mound, roughly 5cm tall, with storming poles and possibly an abattis.