I created some guides to help me get started with the modeling of the castle but they were not the helpful so for most of the modeling I used my own judgment. I started modeling by using a box. By selecting polygons at the side of the box I used the bevel, inset, extrude and the uniform scale tools on different parts on the model. Doing so I was able to get the boxes sides and bottom in a way so that it looks like the same shape of the castle.