This is the last image I'll post before voting begins.
I have airbrushed the thing in several layers of increasingly light nuances of tan grey, trying to emulate the limestone endemic to our island. I masked most of the umber ground work but sprayed most of the rubble the same color as the platform. As the masonry here on Gotland come on a few different colors, I have picked out individual block and shards in a pinkish grey or light tan, to make the impression more interesting and realistic.
Now on to washes, flocking and detailing but that is all for the final post.