There is some clipping issue with build that can't be resolved, but I did find a few that could be. One problem I was having was windows were showing through roofs, if you were on top of a roof. Another major issue was shading of objects.

Trees, rocks, what not were not keeping the shade values I set them to, so they would always be bright in the distance, despite the terrain being dark. Now thats all corrected!

Its a freaking gigabyte!