I have no idea if it's meant to be a permanent construction, or a temporary battlefield fortification. I suspect the latter. Either way it's pleasingly asymmetrical , with odd walkways and bits sticking out here and there . I had a crack at building it with mounting card and tetrion. Here is the result.
The statues in front in the original picture are soapstone chess pieces. I guessed they might be, and after a year or so or scouring ebay for the right chess set I came up trumps with a seller about 30 miles from where I live. I had to buy the whole set, but of course now have 30 other suitable statues. It looks as if one of the pieces has had it's head knocked off, but, stickler though I am for trying to get it right, I can't bring myself to do that to my statues.
Here they are ready to be stippled with tetrion, and then painted. I've added some milliput eyebrows to make them a bit more fierce.