It looks nice.
And Furdle, it's clearly not a direct copy of the Lego Set. It looks to just be a reference for sizing. There are places where he could clearly directly copy and still hasn't, for example the tower walkway is lower in his build than on the Lego Set. Plus his is one large walkway, rather than two thin ones.
You can't claim it's a copy on account of similarity, considering both this build and the set are based on a real life building.