The set was fun to put together. It consists mostly of 1×1 square and round bricks for the outer parts of the building. The inner bricks have the peg that allows you mount the grates vertically mimicking the windows. The build process goes quickly; you build it up layer by layer. Next thing you know, you are attached in the clock faces. It is a good set, well-designed and accurate plus it makes for a great display pieces.
Big Ben 21013