How does he keep it from collapsing? I'm supposing he has used 'builder's sand' as it has that silvery colour and it's more harsh (hence why it's used with cement to make mortar). Otherwise, I hope it has a fence around it or is otherwise well away from a beach the public uses because it would only take one five year old high on ice cream to do the kind of job on it that Sauron's massed forces could only dream about.
