For the things I (would like to) do with the Unreal Engine; an easy integration with SketchUp would be a “match made in heaven”. 
In my dream scenario : I would save the skp; load it in Unreal; generate a “UV / Light map” based on the colors (faces)** in SketchUp and then add/change textures in Unreal.
Trying to do this “UV / Light mapping” in Blender (from a SketchUp model) is at the moment really spoiling all the fun I have with Unreal.
** maybe some “point and click interface” to rotate / click the connecting (texture) faces 