Beautiful! The level of detail is absurd (albeit not too much either). What kind of connection do you use to achieve the slope of your roofs (like for the blue buildings)? That's always the trickiest part of medieval builds for me.
Like @Johnny1360 said, my first thought is snot using arch pieces, but that looks like it might be a major overhaul of your build. Is it possible to raise the wheels further out of the hole?