hey i can create some pretty epic builds... ill get a few of the people i normally build with to speed up the process but at the moment iv been doing builds for my animations to render them out in C4D to use as scenes.. here is my latest one [the image is too big - it only displays half so here is the link
http://imgur.com/VEQ8R] the basic landscape was created in a world editor but then we smoothed off the land and terraformed (by hand) the areas we were building on and then went on to build the castle with the crater (the crater is basically an opening to an underground section with houses etc) so if you give us an idea of what you want doing and where we will get it done