here is the result of my last project (a dome like the dome of cologne without the hole figures). It has over 7000 objects and over 19 million vertices. It is rendered in cycles and need a PC with a lot of ram (i have 12GByte). The materials need a python script called GAO2 from Francois Gastaldo. You can download it from "blenderartists.org/forum/showthread.php?270332-OSL-Goodness&p=2255482&viewfull=1#post2255482". I had copy and past it in an ascii-text-file and called the file "c:\Programme\Blender\Blender-2.70(x64) \2.70\scripts\GAO2.osl". If you have done this, Blender should be find the script. In the other case you have to change the path in the materials or delete the script-node in the materials. The layers 1 - 13 have the dome, layer 14 has a dummy for a better adjustment of the camera. There is an sphere empty that is damp-tracked with the perspective camera for adjustment too.
Since i have realised, that the textures are missing. Sorry for that. Here are links for downloading theses textures :
http://www.pasteall.org/pic/71784 http://www.pasteall.org/pic/71785 http://www.pasteall.org/pic/71786http://www.pasteall.org/pic/71787 http://www.pasteall.org/pic/71788 http://www.pasteall.org/pic/71789http://www.pasteall.org/pic/71790 http://www.pasteall.org/pic/71791 http://www.pasteall.org/pic/71792
I hope you have fun with this building.
With best wishes to all blenders, Mikel007