A model of Harlech Castle taken from blueprints of the ground and using a 2% scale to accurately get the dimensions of each part of the castle. Sadly because of the limitations of sand castle molds not much detail was able to go into this. But a window and door tool are included in the files.

https://upload.wikimedia.org/wikipedia/commons/a/ab/Harlech_Castle_-_Cadw_photograph.jpg