Over 4,000 bags of cement were used, and in some places agricultural lime was used instead of sand for less water seepage. The thinnest inside wall is . The thinnest outside wall is . The roof is greater than thick, and the floor is greater than thick. The roof alone supposedly weighs 423 tons. All walls are load bearing. There are 14 rooms and a two-car underground garage, for a total of about under roof. The upstairs has 7 chimney flues. A six-story deep well is in diameter. In November 1943, Wright Road was widened, and William Nicholson was forced to tear down the entire wall facing the street. He promptly rebuilt it further back. The Castle sits on 6 lots equaling about an acre, and another 1/2 acre next door has been leased. A small white frame house that currently sits on the back lot originally was next to the Castle. It was a "kit home" built to give the Nicholsons a place to live until the main building was finished. It was then moved to its present location.