Would be nice if you could make the following blocks/compounding:
Stone Large Round Interior Corner
Stone Small Round Wall (That will match up walls on the inside of the grid block, current one sits on the outside)
Allow wall with door to placed into the Stone Small Arch, or a variant with the door.
Stone Small Arch with various junctions (similar to Roof Tops)
Stone Large Wall With Entrance have a 'with a Door' variant.
Wooden Support corner variant