People complain about Sketchups texture mapping process....they should give UDK a try.
Just combine all the fragmented google pieces and "render to texture"....easy!
Here are a couple of links to get you started.
http://www.worldofleveldesign.com/categories/udk/udk-import-custom-textures.php
https://forums.epicgames.com/threads/918963-Import-google-sketchup-meshes-(-skp-textures-to-UDK.
ps: I was kidding about it being easy. 😄