Like Kris said, I don't use Layout at all.
James, it is possible, and I do it all the time, to place an image just outside the building in the SketchUp model. No need for Photoshop.
See attached.
Edit: I know the perspective is all off, this is just a quick example. π
http://www.sketchucation.com/forums/scf/sas/Gallery/Image-Model.jpg
And here is the skippy, the skipalator, the skipster, the skip monster, the skippenator, the... ok I'll stop.
Download SketchUp Model