A Castle

 lots of straight lines, no need to try and make curves here. That did not stop there being planning, ground and cliffs and roofs stitched horizontally. The castle walls vertically.  

In some ways this was less stressful that the wyvern.  There are some design deviations here and there but overall it fits.

I like the way the variegated thread has worked here.

Two down, two to go. Castle again for the next square as it was fun

This feels by title if nothing else to be a perfect Forestella song.