I am planning a few builds ahead right now and have a question about the Mason's M1 challenge. It says:"1) Build a castle with an outer wall, an inner wall, and a keep." Do you really want us to build a massive castle with an outer and inner wall? It seems like that would be a huge build (64x64 at least) and I doubt many people have the bricks required to do that. An outer wall and inner wall indicates a walled city as much as a "castle".
I have a feeling that you meant an outer wall, an inner courtyard, and a keep which is much more manageable for the average builder and seems to make more sense in terms of difficulty (the masons guild is already the most challenging of the paths). Having an inner wall which is usually twice as high as the outer wall as well as a full keep inside of that seems like more than normal in terms of the requirements.
If I am not correct and the challenge is what is written, could you provide a few LEGO examples of what you were thinking so that I can better understand the scale of the build, thanks!